| Ervine | numerous: E Ulster etc. Two separate names, but see Irvine & Irwin. |
| Irvine | Very numerous: Antrim, Belfast, Ulster generally, Dublin etc. Scottish, 17 cent in Ulster. An Sloinnteoir Gaeilge gives Ó h-Eireamhóin as Irish version. In Scotland the name is usually Irving, a toponymic. SI & SS. |
| Irving | fairly rare: Dublin etc. See Irvine. |
| Irwin | Very numerous: all areas, especially Ulster. Moderate numbers in S Limerick and E Cork. Ir. O h-Eireamhóin & Ó Ciarmhacáin (SGG). However, MacLysaght considers the name is generally of settler origin, either a synonym of Irvine or from an English first name. |
| Ó h-Eireamhóin | Irwin: bhí an chlann sa in Uí Fhailí anallód ach dealraíonn sé gur sloinnte gallda Irwin agus Irvine de ghnáth. Duine de shinsear na nGael a b'ea Eireamhón cosúil le Ír agus Éimhear. Bhí an t-ainm i bhfeidhm ag muintir Mhic Shuibhne go dtí le déanaí. |
| Orwin | Very rare: Belfast area. English, from Anglo-Saxon first name "boar-friend". See Erwin. |
Parishes where Orwin and a second surname are found together
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