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| Gilgan | rare: N Connacht. Ir. Ó Giollagáin. Dimin. of giolla, attendant. A sept of Sligo-Leitrim, this name is separate from MacGilligan. |
| Gilligan | numerous: all areas, especially Connacht. Ir. Mac Giollagáin. Derived from giolla, a youth, attendant). The sept was associated with Derry. Also Ó Giollagáin in Connacht and changed from Galligan, q.v. MIF. |
| Mac Giollagáin | Mac Gilligan, Gilligan: líonmhar ar fud na tíre. Tá Mac Gilligan le fáil i nDoire go sonrach - a ndúiche shinseartha. Cailleadh an "Mac" de réir a chéile ach tá Trá Mhic Ghiollagáin ar bhruach Loch Feabhail fós. |
| MacGilligan | Quite numerous: Derry etc. Ir. Mac Giollagáin, from giollagán, diminutive of giolla, meaning "little lad". An important sept of Derry. SI. |
| Magilligan | rare: Derry etc. Variant of Mac Gilligan, q.v. |
| Ó Giollagáin | Gilligan: líonmhar: Connachta ach go h-áirithe; ach ní foláir go bhfuil meascadh le Mac Giollagáin agus, b'fhéidir, Ó Gealagáin, q.v. Fréamh: díspeagadh ar "giolla". |
Parishes where Giligan and a second surname are both baptised.
This list shows total Giligan Roman Catholic baptisms by county.
Click on the county to see detail.