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Kelly Surname Meaning Irish: Anglicized form of Gaelic Ó Ceallaigh or in some areas Mac Ceallaigh ‘descendant (or son) of Ceallach’ an ancient Irish personal name originally a byname meaning ‘bright-headed’ later understood as ‘frequenting churches’ (Irish ceall). There are several early Irish saints who bore this name. Kelly is now the most common of all surnames in Ireland. Scottish: habitati...