Meaning A boy's name of Gaelic origin, it means "Proud." Origin of Diomasach Gaelic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Diomasach Similar Names Dempsey Donal Donald Peadar Bealantin Gabhan Gearald Gille Raibeart Stiabhan Year by Year Popularity of Diomasach