| Gillan | numerous: Antrim, Ulster generally, Connacht. Ir. Ó Giolláin, dimin. of giolla, an attendant. These were a family of Cineál Eoghain (Tyrone). There were probably other sources in Connacht. SI. |
| Gillane | Very rare: Galway. See Gillan. |
| Gillen | numerous: Ulster, Connacht, Midlands. See Gillan. |
| Ó Giolláin | Gillan,-en: líonmhar: Aontroim, Ulaidh i gcoitinne, Connachta. Bhí clann de Chinéal Eoghain ann (Tír Eoghain) agus clanna eile i gConnacht. Tá an bhrí ar aon dul le Ó Giollagáin. |
Parishes where Gillane and a second surname are found together
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