Question: is mcmorrow an irish name?
Answer: Irish. Although a Scottish name, it has been used to anglicise a number of Irish Gaelic names, mainly "Murchadh" (muir and cath) meaning "Sea Battle" or "Sea Warrior", which was also made as Morrogh, Murrow, Moroghoe, and Murphy. In Petty's Census of 1659 O'Morrow and McMarrowe are recorded.