Gahan (surname) Irish language "Mac Gaoithín", meaning "son of "Gaoithín"", although the more common Anglicised form of this Gaelic name is "McGeehan" in Ulster. Gahan (surname) Gahan (and its variant Gahame) is a surname with several different origins. One origin of the surname is from a reduced form of "McGahan", which is in turn an Anglicised form of the Irish language "Mac Eacháin", meaning "son of "Eachán"". Another origin of the name, in Leinster, is from a reduced form of the Irish language "Ó Gaoithin", meaning "descendant of "Gaoithín"". The personal name "Gaoithín" is a diminutive of "gaoth", meaning "wise", or "wind".
Mongan (surname) astonishing variants of the original spelling. Notable people include: Mongan (surname) Mongan is an Irish surname anglicised. It derives from the ancient and possibly pre 10th century Gaelic Ó Mongáin ‘descendant of Mongan’. The latter was a nickname for the original chief of the clan, who presumably had a particularly luxurious or wild growth of hair. Many, perhaps the majority of Irish Gaelic surnames were nicknames for the original chief or leader, see Mongán mac Fiachnai this is a good example. The derivation is 'mong', meaning long-haired. Three branches of this clan originally existed in ancient Ireland. These were a