Colton is a surname of mainly Irish origin. Mac Comhaltan Ua Cleirigh, King of Ui Uí Fiachrach aidhne IN ad 964 appears to be the first recorded use of this. Name Mac comhaltan was an early member of THE O ó, cleirigh cléirigh family reputedly the Oldest. surname in europe1] An English variation of the name is Colby; Irish variations include O'Comhaltain (Irish: O ó) comhaltain Comhaltáin, and collin Anglicized. as colton