| Families |
Ethnic Group |
Branch of |
| Georgeson |
|
Gunn |
| Gilbert |
IVL - Leinster |
|
| Gilbert, Gilbertson |
|
Buchanan |
| Gilbride |
|
MacDonald (Clan Donald) |
| Gilbride |
IVL - West Ulster |
|
| Gilchrist |
|
MacLachlan |
| Gilchrist |
|
Ogilvy |
| Gilchrist |
IVL - North Connacht, Longford |
|
| Gilfillan |
|
McNab |
| Gilfillan |
IVL - Ireland |
|
| Gillan, Gillon |
|
MacLean |
| Gillanders |
|
Ross |
| Gillanders |
IVL - North Ireland |
|
| Gillespie, Gillies |
|
MacPherson |
| Gillespie, Gillies |
IVL - S. Scotland, Ireland |
|
| Gilmore |
|
Morrison |
| Gilmore |
IVL - Ulster |
|
| Gilzean |
|
MacLean |
| Ginnaw, Ginnane |
|
MacKenna |
| Glaughlin |
|
MacLoughlin (Ulster) |
| Glencairnie |
Cruithne |
|
| Gloughlin |
|
MacLoughlin (Dublin) |
| Gordon |
IVL - Ireland |
|
| Gordon |
Normans |
|
| Gorman |
|
O'Gormley |
| Graham |
Normans |
|
| Graham |
|
O'Gormley |
| Graham |
IVL - East Connacht |
|
| Grannell (Wexford) |
|
MacRannall |
| Grant |
Normans |
|
| Gray |
|
O'Rourke |
| Gregor |
|
MacGregor |
| Gregory |
|
MacGregor |
| Grierson |
|
MacGregor |
| Griffin |
|
O'Griffey |
| Griffin |
IVL - Connacht, Offaly |
|
| Grimes |
|
O'Gormley |
| Grimes |
IVL - Connacht, South Ireland |
|
| Growney |
|
MacCaron |
| Gucklan |
IVL - Ulster |
|
| Gucklan |
|
Hackett |
| Guinness |
|
MacGenis |
| Gunn |
IVL - Ulster |
|
| Gunn |
Vikings |
|
| Hackett |
IVL - Ulster |
|
| Hackett |
Normans |
|
| Haldane, Halden |
IVL - South Scotland |
|
|
