| Modern and Anglicised Forms | Old Irish Forms | Meanings |
| Gaff, Gaffey, Gaffney | ||
| Gaffigan | ||
| Galbrath | ||
| Galligan, Gallagan, Gealan, Geelan | O'Gealigain | |
| Gallager, Gallagher, Gallaher | ||
| Gallahue | ||
| Gallivan | ||
| Galvin | ||
| Gambell, Gamble | O'Maoilchluiche | |
| Ganly | Mac Anluain | |
| Gannon, Ginnane | Mag Fhionnain | |
| Gant | ||
| Garigher | ||
| Garr | ||
| Garrahan | ||
| Garvey, Garvy, McGarvey | ||
| Garvin | ||
| Gasaway | ||
| Gately, Keightley, Catley | O'Gathlaoich | |
| Gatens | ||
| Gaughan, Gahan | O'Gaibhtheachain | |
| Gavaghan, Gavigan | ||
| Gavin | ||
| Geary, Gerry, McGeary | O'Gearadhain | |
| Gehan, Gahan, Gettins | O'Gaoithin | |
| Genty | ||
| Geoghan, Geoghegan, Gegan | ||
| Geraghty, Gerrety, Garraghty, Garrett, Garritty, Heraghty, Herity, Harrington | O'h-Oireachtaigh, O'h-Heraghty, MacGeraghty | |
| Ghaney | ||
| Gibney | ||
| Gielty | ||
| Gilbride | ||
| Gildae, Gilday, Gildea | ||
| Gilfillon | ||
| Gilfoyle, Guilfoyle, MacGilfoyle, Paul | MacGiolla Phoil | |
| Gilhooly, Gilhuley | ||
| Gillan, Gillen | ||
| Gillespie, (Bishop) | MacGiolla Easpaigh | Son of the follower of the bishop |
| Gillham | ||
| Gilligan, Gilgun | ||
| Gillin | ||
| Gillmor, Gilmer, Gilmore | MacGilimir | |
| Gilmartin | Mac Giolla Mhartain | Follower of St. Martin |
| Gilpin, Gilfin, Gill | MacGillifin | |
| Gilroy | Mac Giolla Ruaidh | 'Son Of The Red-Haired Lad''? |
| Gilsenan | ||
| Giltinan, Giltinane | ||
| Ginnaty | ||
| Glancey, Glansey | ||
| Gleason, Gleeson | ||
| Glennon, Glenin, Glinn, Gloin, Glynn | O'Gloinin | |
| Goddan, (Godwin) | O'Gadain | |
| Godsil | ||
| Gogarty | ||
| Goggin | ||
| Gollogly, Gallogy, Ingoldsby | MacGallogly
Maclnogly |
|
| Gorey | ||
| Gorham | ||
| Gorman, O'Gorman, O'Garman? | O'Gormog
O'Gormghail |
|
| Gormilly,Gormally, Gormley, Grimley | O'Goirmghiallaigh
O'Gairmleadhaigh |
|
| Goslin | ||
| Gough, Goffe, Goff, McGough | O'Cuaghain | |
| Gourley | ||
| Governey | ||
| Grakane | ||
| Granard | ||
| Graney | ||
| Grannan | ||
| Gratten | ||
| Graulty | ||
| Greaney, Greany | ||
| Greehy | ||
| Greeley | ||
| Greer | ||
| Gregan, Greghan, Grehan, Crehan, (Graham) | O'Creachain | |
| Gregg | ||
| Gribbin | ||
| Griffen, Griffin, Griffy | O'Griobbtha | |
| Guinan | ||
| Guiney | ||
| Gunning | O'Conaing | |
| Gurnett | ||
| Guthrie | O'Lahiff | |
| Hackett | ||
| Hadden | ||
| Haffey | ||
| Hafner | ||
| Hagan, O'Hagan | ||
| Halley, Hailey, Hale, Haley, Ally | O'h-Ailche | |
| Haliday | ||
| Hallahan, Halligan | ||
| Hallinan | ||
| Halloran, Hallaren, O'Halloran | ||
| Halpin | ||
| Hamill, Hammill | O'h-Aghmaill | |
| Hand | MacLave | Lamh hand |
| Handran | ||
| Haney | ||
| Hanifan, Hanifin | ||
| Hanley, Handley, Hanly, O'Handley | ||
| Hanlin, Hanlon, O'Hanlon | ||
| Hanna | ||
| Hannan, Hannon | ||
| Hannigan | ||
| Hannity | ||
| Hanrahan, O'Hanrahan | ||
| Hanratty | ||
| Haran | O'h-Arain | |
| Harden | ||
| Hardiman | ||
| Harkin, Harkins | ||
| Harney | ||
| Harrigan | ||
| Hart, Heart, O'Hart | ||
| Hartigan | ||
| Hartnett | ||
| Harty | ||
| Harvey | ||
| Hatchell | ||
| Hatty, Hetty | O'h-Aidith | |
| Haugh, Haughee, Hoy, Hoey, Hawe, Howe | O'Haughey | |
| Haughion | O'h-Eochagain | |
| Hay, Hayes, Hays, Hughes | O'Hay | |
| Heaney, Heany, Heagney? | O'h-Eana | |
| Healey, Healy | ||
| Heanaghan | O'h-Eidhneachain | |
| Heasty | ||
| Hefferman, Heffernan | ||
| Hegarty, Hegerty, Hagerty, Haggerty | ||
| Heggessy | ||
| Hellam | ||
| Hellon | ||
| Hellowell, O'Hellowell | ||
| Helvick, Helwick | O'h-Oilmhec | |
| Henchion | ||
| Henebry | ||
| Henly, Hennley | ||
| Henn | O'h-Enda | |
| Hennaghan. Heneghan | ||
| Hennessey, Hennessy, Hennesy | ||
| Herlihy, Hurley | ||
| Hernan, Hernon | O'h-Iarnain | |
| Herne, Hearn, Hearne, Hurn, O'Hearn, O'Hern | O'h-Eimhirin | |
| Heron | ||
| Heslin | ||
| Hetherington | ||
| Hett | ||
| Hickey | O'hIceadha | Desc of the healer |
| Hinchey | ||
| Hinchion | ||
| Hoar, Hoare | ||
| Hoban, Hobin | Muntir Ubain | |
| Hogan | O'Hogain? | |
| Hoke | ||
| Holland | ||
| Holley, Holly | ||
| Holligan, Holian | ||
| Holohan, Holohan | ||
| Horan, Hamran | O'h-Uathmharain | |
| Horgan, O'Horrigan? | ||
| Hough | ||
| Houlihan | ||
| Houneen, O'Houneen, O'Honeen, (Greene) | MacUaithnin? | |
| Hourahane, Hourigan | ||
| Hughes | O'Aodha | |
| Hurley, Harley | O'Hurley | |
| Hurst | ||
| Hussey, Oswell | O'Hease | |
| Hyland | ||
| Hynes, O'Heyne | O'h-Eidhin | |
| Ivers, Ivors, McIvor, (Howard) | O'h-Iomhair, Maiomhair | |
| Jardan | ||
| Kane | O'Cathniadh | |
| Kavanagh, Kavanaugh, Kavangh, Kaveny, Cavanagh, Cavanah, Cavanaugh, Keveny, Kevin, Cowen, Cohen, Coen | O'Caomhain | |
| Keane, Kane, Kyan, O'Keane | O'Cathain | |
| Keaney | ||
| Kearn, Kearns, Kearins | O'Ceirin | |
| Kearney, Carney | O'Cearnaigh | |
| Keary, McKeighry | MagFhiachra | |
| Keating, Keatinge, Ceitinn | O'Ceadfhada | |
| Keaty | O'Ceathaigh | |
| Keedy | ||
| Keegan, Keeghan, Cockane | MacCiochain | |
| Keelan, Keelchan, MacCallin (Coward) | MacCailleachain | |
| Keeler | ||
| Keelty, Kelty, Kielty, Kilty | ||
| Keely, Kealey, Keily, Kiely, Kaely, Cayley | O'Caolloaidhe | |
| Keenan | ||
| Keevan | ||
| Kehoe | ||
| Keirans, Kieran | ||
| Kellahan | ||
| Kellegher, Kelleher | ||
| Kellett | ||
| Kelly, Kelley, O'Kelly | O'Ceallaigh, O'Ceallachai? Muintir Ceallaigh | Desc of Ceallaigh (ceallach strife) |
| Kenehan | ||
| Kenn, Kenna | ||
| Kenneally, Kennealy, Keneally, Kenealy, Kennelly, Kenelly | ||
| Kennedy | O'Cinneide | Ceann head, eidigh ugly |
| Kenney, Kenny | ||
| Kennyon, Canning | MacConin, MacCoinin | |
| Keohane | ||
| Keough, Keogh, McKeough | ||
| Kernaghan | O'Cearnachain | |
| Kernan | ||
| Kerr | NF | |
| Kerrigan | O'Ciaragain | |
| Kerrin | O'Ceirin | |
| Kerruish | ||
| Kevigan | O'Caemhagain | |
| Keyes | ||
| Kilbain | ||
| Kilbride, Kilbridge | ||
| Kilcullen | ||
| Kilduff, Gilduff | Mac Giolla-Duibh | |
| Kilfeather | ||
| Kilgallon | ||
| Kilgannon | ||
| Kilgore | ||
| Kilkelly, Killikelly | Mac Giolla-Cealaigh | |
| Kilkenny | Mac Gilla Kenny | |
| Killeen, Killin, Culleen | O'Gilin | |
| Killick | ||
| Killpatrick, Kirkpatrick? | Mac Giolla Padraig | Son of the follower of St. Patrick |
| Kilmartin | ||
| Kilmeade | ||
| Kinahan | ||
| Kinealy | O'Cinnfhaelaidh | |
| Kinnane | ||
| Kinnavy (Bones) | O'Cinnchnambha | |
| Kinsella | ||
| Kirby | O'Ciarmhaic | |
| Kirwan, Kerwin | ||
| Kivlahen, Kivlehan | ||
| Kneafsey | ||
| Kyle | ||
| Lacey, Lacy | ||
| Laffan | ||
| Laing | ||
| Lalley, Lally | ||
| Lamb, Lambe | O'Luane | |
| Lambkin | ||
| Lanaghan, Lanahan, Lannigan, Lanigan, Lanergan, Langan, Lannen, MacClanaghan? | Mag Lannagain | |
| Landregan, Landrigan | ||
| Lane, Lahan? | O'Laoghain | |
| Lappin | ||
| Largay | ||
| Larkin, Larcom | O'Lorcain | |
| Latteray | ||
| Laughead | ||
| LaVelle, Lavelle | O'Mullaville | |
| Lavender | ||
| LaVerge | ||
| Laverty, Lafferty | ||
| Lavery | O'Labhrahadha | |
| Lavin | ||
| Lavy, Laffey, Lahey? | ||
| Law | ||
| Lawder | ||
| Lawless | ||
| Lawlor, Lawler, Lalor | ||
| Lawn | ||
| Lawton | ||
| Leachán, Lehan | ||
| Leasy, Larrisy | O'Learghusa | |
| Leavy, Levy | ||
| Ledwich, Ledwick, Ledwidge | ||
| Lee | O'Laodhog | |
| Leehey, Leehy, Leahy | ||
| Leigh, Lye | MacLaighid | |
| Lemon | ||
| Lenergan | ||
| Lennon, Lannen (Leonard) | O'Leannain | |
| Lennox | ||
| Lenty, Lente | ||
| Leraton | ||
| Lester | ||
| Liddane | ||
| Liddy, O'Liddy | Muintir Lideadha | |
| Liggan | ||
| Lilly, Leach, Leech, Leitch | O'Laechaille | |
| Linighan, Linnegan, Lenihan, Linehan | ||
| Linnane | ||
| Linton | ||
| Loane, Olohan? | O'Luain | |
| Lockhart | ||
| Logan | ||
| Logue | ||
| Lomasney | ||
| Lonergan, Londergan | ||
| Longhan | O'Lochain | |
| Looby, Luby | ||
| Loody, Ludy | O'Luachduibh | |
| Looney | ||
| Loounane | ||
| Lord | ||
| Lorden | ||
| Lorigan, Largan, Legge | O'Lairgnen | |
| Louden | ||
| Loughnane, Loughnam, (Loftus) | O'Lachtnain | |
| Loughran, Loughrin | ||
| Lowry, Lowery | ||
| Lucey, Lucy | ||
| Lundie | ||
| Lundragon | ||
| Lunney | ||
| Lunshekaun | O'Loingseachain | |
| Luxom | O'Luachaim | |
| Lyden | ||
| Lydican | O'Laighdiachain | |
| Lydon | ||
| Lyman | ||
| Lynagh | ||
| Lynam | ||
| Lynsky, Lynch | O'Loingsigh, MaGloinsg | |
| Lyons | O'Liathain | |
| Lyttle, Little | O'Laitile | |
| Macaleese | ||
| MacAlevy | ||
| MacAllen | ||
| MacAllister | ||
| MacAnally, McAnally, MacNally, McNally | ||
| MacAndrew, McAndrew McAndrews, Andrews | MacAindris | |
| Macaninch | ||
| MacArdle, McArdle | ||
| McAsey | ||
| MacAteer, Macteer | ||
| MacAuley, Macauley, McAuley, McCauley, McCauly, McCawley, McAuliff, McAuliffe, Macauliffe | ||
| Macavaddy | ||
| McAvay, McAway | ||
| MacAvee, Kilboy, Gilboy | MacGilli-Bhuidh | |
| MacBrehon | judge | |
| MacBride, McBride | ||
| McBurney | ||
| MacCabe, McCabe | ||
| MacCafferky, MacCafferty | ||
| MacCaffrey, Caffrey, McCaffery, McCaffrey, Caffrey | ||
| MacCall, McCall, Call | ||
| McCamly | ||
| MacCann, McCann, McCanna, MacCana? | ||
| McCarl | ||
| MacCarron, MacCarroon, MacCarhon, Carron, Carson, Carse? | MacCarrghanma | |
| MacCarthy, McCarthy, MacCartney? McCarty, Carthy, Carty | Mac Carthaigh | Carthach loving |
| MacCarrick | MacConcathraigh | |
| MacCaughan | ||
| MacCaw | ||
| MacCecht | ||
| MacCiochain | ||
| McClatchey | ||
| McClay | ||
| McClelland, Cleland | ||
| MacClintock | ||
| McClinton | ||
| McClire | ||
| McClory | ||
| McClughan | ||
| MacClumpha | ||
| MacClure, McClure | ||
| MacCluskey, MacCloskey, McCloskey, MacClosky, McCluskey, Closky | MacBlosky | |
| MacCochlann | ||
| McCollum | ||
| ____ | MacConleitrech | |
| MacConaughey, McConaughey | ||
| McConnville, McConville | ||
| MacConrai | ||
| MacCormack, MacCormick, McCormack, McCormick, McCromick | ||
| MacCorquodale | ||
| MacCourt, MacCort, McCord | ||
| MacCoy, McCoy | 'Son Of Aodh' | |
| MacCracken, McCracken | ||
| MacCready, Macredie | ||
| MacCruddan, MacCrudden, Cruden | ||
| MacCuill | ||
| MacCulloch, MacCullough, McCulloch, McCullough | ||
| MacCune | ||
| MacCuolahan | ||
| MacCusker, Mccusker | ||
| MacDaid | ||
| MacDermott, McDermott, Carmody, Kermode, Kermody, Diarmid | O'Duibhdiorma | |
| MacDevitt, McDevitt, Devitt | ||
| MacDonagh, MacDonough, McDonough | ||
| MacDonald, McDonald | ||
| MacDonnell, McDonnell | Mac Domhnaill | |
| MacDowel, McDow? | ||
| MacEachern | ||
| MacElderry | ||
| McElhatton | ||
| McEllgunn | ||
| MacElligot, MacElligott | ||
| MacEllistrim | ||
| MacEnery | ||
| McEnhill | ||
| MacEnroe, MacEnchroe | ||
| McEntee | ||
| MacEochagan | ||
| MacEvilly | ||
| MacEvoy, McAvoy, McEvoy, | ||
| MacFadden, McFadden | ||
| MacFall | ||
| MacFarland, Macfarlane, Parlan | MacPartholain, Mac Pharlain | |
| McGaghran, McGaughren | ||
| McGalloway, Galwey | ||
| MacGann | ||
| MacGarrigle | ||
| MacGarry, McGarry, Garry | ||
| McGaughy, McGahey | ||
| McGauley, Gaule | ||
| McGavisk | ||
| McGaw | ||
| MacGee, McGee, Magee, MacGehee? | MagAedha | |
| MacGeogh, McGeough | ||
| MacGil, MacGill, Magill, Gill | MacGiolla | |
| MacGillycuddy, McGillicuddy | ||
| McGilton | ||
| MacGinley, McGinley, McKinley | ||
| MacGinn, McGinn, McGing | ||
| McGinty, McGinity | ||
| McGivney | ||
| MacGlashan | ||
| MacGlinchy | ||
| MacGlynn | ||
| MacGolderick, MacGoldrick, McGoldrick, Goderich, Golding, Goulding, Golden, Goldrick, Waller | MacUlahairg | |
| McGonigal, McGonigie | ||
| McGourty | ||
| MacGovern, McGovern | ||
| MacGowan, MacGowran, McGowan, O'Gowan, MacGoohan? Gowran | Mac an Ghabhann | smith |
| McGrail, McGreal | ||
| MacGranahan, Granaghan, Granahan | ||
| MacGrane, MacGreine | ||
| MacGrath, McGrath, MacGraw, McGraw | ||
| McGreevy | ||
| MacGrogan, Grogan | ||
| McGuckin, Guckeen, Guckian | ||
| McGuigan, Maguiggan, Goodwin, Godwin | MacGuiggan | |
| MacGuinness, Macginnis, McGinnis, MacGenis, McGuinness, Guiness | ||
| MacGuire, McGuire, Maguire, Macgwire | ||
| MacGuirk, McGuirk | ||
| McGunn | ||
| MacHoneen, Green, Greene, Tonyson, Tennyson | MacUaithnin | |
| MacHugh, MacQue, McHugh, McCue | ||
| McIlmail, McIlmale | ||
| MacIlrea, Kilrea (Gray) | MacGilli-Riabhaig | |
| MacIlroy, McElroy | ||
| MacIlvany | ||
| McIlveen | ||
| MacIlvenna | ||
| McIlwee | ||
| MacInerney, McInerney | ||
| MacIntyre, McIntire, McIntyre | ||
| MacInver, Maginver, Gaynor | MacFinnbhair | |
| Mack | ||
| Mackay, Mackee, Mackey, MacKey, McKay, McKee | ||
| McKean, McKane | ||
| McKechnie | ||
| McKeever, McGeever | ||
| McKeighry | ||
| MacKelvey, McKelvy | ||
| Macken | MacCuinn | |
| MacKenna, McKenna | Mac Cionnaith | |
| MacKeon, Mackeone, Mackeown, McKeown, MacOwen | MacEoghain | |
| McKiernan, Kiernan | ||
| MacKinnawe | ||
| McKinney, Kinney | ||
| McKinnon | ||
| McKitrick, McKittrick | ||
| McLaren | ||
| MacLarty, Larety? | ||
| MacLaughlin, MacLoughlin, McLaughlin, McLouglin, Magloughlin, O'Loughlin, O'Laughlin, Loughlin | Mac Lochlainn | |
| MacLean, McLain | ||
| MacLysaght, Lysaght | ||
| McMaham | ||
| MacMahon, McMahon, McMahan, (Matthews), Fitzursula? | ||
| McManamin, McMenamin | ||
| MacManus, McManus | ||
| MacMathan | ||
| McMerriman, Merryman, Merriman | MacGillimore | |
| MacMonagle | ||
| McMullen, Mullan, Mullane, Mullen | ||
| MacNamara, McNamara | ||
| MacNamee, McNamee, Meath, Mee | ||
| McNaughton, Naughton | ||
| MacNebo, MacNaboe | 'victory' | |
| McNeese, MacNeice | ||
| MacNeill, MacNeil, McNeil | Mac Neill | Son of Neill |
| McNellis, McNelis, McNelly, Nellis | Mac Niallais | |
| McNerney | ||
| MacNevin, Nevin | ||
| McNicholas | ||
| MacNulty, McNulty | ||
| MacParlan, McParlan, McParland, McParlin, Bat, Bats, Batson, Bateson | MacPartholain | |
| McPike, Pike | ||
| McQuade, Quaid | ||
| MacQuilkin, MacCulkin? | ||
| MacQuillan, MacQuillen, McQuillan | ||
| MacQuilly | ||
| MacQuirk, Quirk, Quirke | ||
| MacRaith | ||
| MacReamoinn | ||
| McRickard | ||
| MacRory, MacCrory, McCrory, McCrary | ||
| MacShane, McShane | ||
| McSherry | ||
| MacSorley, McSorley, McSloy? | ||
| MacTague, MacTeig, McTigue, (Montague, Montagu) | MacTaidhg | |
| MacTavish, MacIltavish | MacGilla Samhais | |
| MacUlhaney, McElhinney | ||
| MacVeigh, McVeigh, McVeigh | ||
| McVerry | ||
| McWay, McWey | ||
| McWilliams |
This collection of names was compiled by Kate Monk and is ©1997, Kate Monk.
Copies may be made for personal use only.