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: