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".
Orr (surname) name is from a topographical name for a person who lived on a shore, or ridge. This name is derived from the Old English "ora", meaning "shore", "hill-slope", "flat-topped ridge". The name could also be derived from a place-name, derived from this Old English word; for example, the surname "Ore" is derived from Oare, in Berkshire, Kent; and Wiltshire; or Ore, in East Sussex. Padraig Mac Giolla Domhnaigh, suggested that the Irish surname originates from an Anglicisation of Gaelic "Mac Iomhaire". Mac Giolla Domhnaigh stated that this was an old name from Renfrewshire, and a sept of the Campbells; he