With the spread of Christianity, bynames incorporating 'giolla' or 'maol' (follower or devotee) developed. These are generally found in the forms 'Gil-' or 'Mul-' in modern Irish surnames. Names of Catholic saints and festivals also occur.
| Given Name and Variants | Diminutives | Meaning |
| Gille na Naomh | Naomhán, Niven | servant of the saint |
| Giolla Dhé | Servant of God | |
| Giolla-Bhríde | servant of Bridget | |
| Giolla-Chríost | servant of Christ | |
| Giolla-Easpaig, Giolla-Easpuig | servant of the bishop | |
| Giolle Máire | servant of Mary | |
| M« elbrigte | Devotee of Brigid | |
| Maelchon | ||
| Maelduib, Maeldub | ||
| Maelmaedóc, Maol Maodhóg | devotee of Maedoc | |
| Maelmithidh | ||
| Maelruain | ||
| M« elrunaidh | ||
| Maelsuithan | ||
| Mainchín, Manchen, Mannix Maine? | 'manach' monk | |
| Maoileachlainn, Maeleachlainn, Maelsheachlainn, M« elsechlain, Maelaghlin, Melaghlin, (Malachy) | devotee of St Seachnall | |
| Maoilíosa, M« el osu Maol osa, M« el su, Maeliosa, Melisa | devotee of Jesus | |
| Maol, Mael | Devotee | |
| Maolbheannachta | ||
| Mael Coluim, Maolcholuim, Maolcolm, Maolcholm, Maolcholaim, Malcolm | Devotee of St Columba | |
| Maolmhuire | Maolra | Devotee of Mary |
| Maolmórdha | ||
| Maoluadhand |
| Given Name and Variants | Diminutives | Meaning |
| Assumpta | Assumption of the virgin | |
| Concepta | Immaculate conception | |
| Madonna | It 'my lady' ie Virgin Mary | |
| Majella | St Gerard Majella | |
| Maoilíosa | Devotee of Jesus |
This collection of names was compiled by Kate Monk and is ©1997, Kate Monk.
Copies may be made for personal use only.