Matheson (surname) as the Gaelic "mathghamhuin" means "bear". Another Gaelic surname Anglicised "Matheson" is "Mac Matha". This Gaelic surname is derived from the patronymic form of a Gaelic form of "Matthew" (for example, the modern Scottish Gaelic "Mata" and "Matha" are cognates of the English "Matthew"). Matheson (surname) Matheson is a surname derived from the patronymic form of a short form of the English "Matthew". This English personal name is ultimately derived from the Hebrew "Mattathia", which means "gift of God". An early record form of the surname "Matheson" is "Mathyson", recorded in 1392; this recorded name literally means "son of "Mathi""—"Mathi"
Mac Aodhagáin Flann Mac Aodhagáin up to the year 1643. The surname has been Anglicised in a variety of ways, including as Mac Egan, Egan, Eagan, Keegan, or Keigan, McKiegan, and McKagan. Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Muirchertach Mac Aodhagáin Mac Aodhagáin Mac Aodhagáin (English: Egan or Keegan), is an Irish Gaelic clan of Brehons who were hereditary lawyers - firstly to the Ó Conchobhair Kings of Connacht, and later to the Burkes of Clanricarde. The earliest surviving Irish law manuscript, "In Senchas Már", was written prior to 1350