Type Word Usage Old Irish Meaning & History Old Irish word meaning "root, bottom" [1]. Related ItemsDetails Given Name DescendantsMonroe, Munro, Munroe(English) Surname DescendantsMonroe, Munro, Munroe(Scottish) Same Spellingbùn Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 71.