|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.|
|Orwin||Very rare: Belfast area. English, from Anglo-Saxon first name "boar-friend". See Erwin.|
Parishes where Irwine and a second surname are found together
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