40%RatingSave Gender Masculine Usage Old Irish [1] Meaning & History Old Irish name derived from dub "dark, black" in combination with a second element of unknown meaning. This was the name of a 6th-century saint, a bishop of Armagh. It also appears in Irish legend as a companion of Fergus mac Róich. Categories black, colors, dark, saints Sources & References O'Brien, Kathleen M. Index of Names in Irish Annals, available from https://medievalscotland.org/kmo/AnnalsIndex/Masculine/Dubthach.shtml.