Mac Ospaic Mac Ospaic Mac Ospaic is masculine surname in the Irish language. The name translates into English as "son of "Ospac"". The surname originated as a patronym, however it no longer refers to the actual name of the bearer's father. There are specific forms of the surname that are borne by married and unmarried females. There is at least one Anglicised form of the surname. "Mac Ospaic" translates into English as "son of "Ospac"". The surname originated as a patronym, however it no longer refers to the actual name of the bearer's father. The name "Ospac" is a Gaelic derivative of
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