Gilmore (surname) lad". Gilmore (surname) Gilmore and Gillmore are surnames with several origins and meanings. The name can be of Irish (from Ulster) and Scottish Highland origin, Anglicised from the Gaelic "Mac Gille Mhoire" (Scottish Gaelic), "Mac Giolla Mhuire" (Ulster Irish Gaelic). The name was a patronymic name meaning "servant of (the Virgin) Mary". Another origin of the surname Gilmore is Irish, with two separate meanings. In County Armagh, the name is an Anglicised form of "Mac Giolla Mhura" "servant of St. Mura" (of Fahan, County Donegal). In County Sligo, "Gilmore" is an Anglicisation of "Mac Giolla Mhir" meaning "son of the
Eolais mac Biobhsach manuscripts going back almost two hundred years. O'Donovan claimed the family name ( "descendent of Eolais") is still found anglicised as "Olus" or "Olis". two instances of the surname corrupted as "Oelase" and "Olase", are found in the Irish Fiants for Leinster. The surname must be very rare. Eolais mac Biobhsach Eolais "mac Biobhsach" (alias " "knowledge", anglicized "Wallis", "Olis" or "Olus" ) was a chieftain of 10th century Gaelic Ireland. He is noted as the first "full chieftain of Conmaicne Réin". His descendants, "the Muintir Eolais", expanded into the territory of present day south county Leitrim, and parts of