Smith (surname) usage has passed into "Smitty" being used as a surname itself. Other languages with different words for the occupation of "smith" or "blacksmith" also produced surnames based on that root. Words derived from the Latin term for smith (literally "one who works with iron"), such as the Italian words "fabbro" and "ferraio", are the root of last names common in several parts of Europe. In Ireland and Scotland, the word for smith, "gobha", is found in the surname "MacGouren"/"MacGouran"/"MacGowan"/"McGowan". This surname is an Anglicised form of "Mac a' Ghobhainn" (Scottish Gaelic), "Mac Gabhann" (Irish), meaning "son of the smith". In
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