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Caulfield is a surname of several separate origins.[1] It may occasionally be of English origin,[2] but in Ireland is often a simplified form of a number of Gaelic surnames, including Mac Cathmhaoil,[3] an Ulster family traditionally descended from Niall of the Nine Hostages.[4] It is also known to be an anglicized form of Ó Gamhna, Ó Gamhnáin and “Mac Congamhna”. A variant Caulfeild, were an Anglo-Irish family (see Earl of Charlemont). Notable people with this surname include: