Variant of Maurice. The spelling Morris was quite common as a given name in the Middle Ages, but it fell out of use and was readopted in modern times, in part from the surname earlier derived from the given name. Among Jews it has been adopted as an Anglicized form of Moses.
Scottish and Irish: Anglicized form of Gaelic Mac Neachtain, a patronymic from the personal name Neachtan, a name of the god of water in Irish mythology. This is cognate with Latin Neptunus ‘Neptune’, the Roman sea-god.