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"
McKinley (surname) nickname given the deposed MacDunleavy dynasty royals while exiled in Tirconnell and elsewhere. Being, also, one of Ireland's ancient hereditary medical families, the MacDunleavy (variant English spelling MacDonlevy) were in Tirconnell accorded the high Gaelic status of "ollahm leighis" or the official physicians to the O'Donnell clan in County Donegal and practiced as physicians while exiled in Argyll, Scotland. The nickname was Mac an Leigh. Per this scenario the Gaelic language patronymic forming prefix "Mac" (meaning "descended of") is joined to the Gaelic language "Léigh" meaning leech, but denoting a physician. Leeching (medical) having been for millennia, in Gaelic Ireland