Dunleavy

Donlevy, Dunlevy, Donleavy and Dunleavy are Irish surnames derived from the Gaelic Mac Duinnshléibhe/Ó Duinnshléibhe 'son/descendant of Donn Sléibhe'; a given name meaning 'Donn of the mountain', i.e. 'dark mountain'. The MacDonlevys were the hereditary rulers of Dál Fiatach and styled as the Kings of Ulaid, i.e. rulers of (east) Ulster, in present-day County Down.