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".
Gillespie (surname) Gillespie (surname) Gillespie () is both a masculine given name, and a surname in the English language. The given name is an Anglicised form of the Gaelic "Gille Easbaig" (also rendered "Gilleasbaig"), meaning "bishop's servant". The surname "Gillespie" is an Anglicised form of the Scottish Gaelic "Mac Gille Easbuig", and the Irish "Mac Giolla Easpaig", both of which mean "servant of the bishop". The given name itself is derived from a word of Latin origin. Specifically, the Old Irish "epscop" being derived from the Latin "episcopus". An early example of the name in Scotland occurs in a charter dated 1175–1199,