Meaning A boy's name of Gaelic origin, it means "Man from South Munster." Origin of Deasmumhan Gaelic , Irish Popular Middle Names Pronunciation 🔊 Listen Deasmumhan Similar Names Deasach Desmon Derwynn Diarmaid Dallan Dermot Donal Beagin Frannsaidh Gayner Year by Year Popularity of Deasmumhan