1. Welsh: from the Welsh personal name Owain, probably a borrowing in Roman times of Latin Eugenius (see Eugene), but possibly of more ancient Celtic origin, cognate with Gaelic Eoghan.
2. Scottish and Irish: reduced Anglicized form of Gaelic Mac Eoghain ‘son of Eoghan’ (see McEwen).
See the Key to the Dictionary or consult the General Introduction for further explanation.