The origin of this name is still today quite uncertain. The theories include: From the Old English "Brom Dun" or the Irish "Bréanainn", which seems to derive from the Latin "Brendanus" and is probably Lombardian. There is no certainty who first adopted the name. There are many saints who have the name "Bréanainn" and "Brendanus" and the sources are always conflicting. 1) The name comes from old English “Brōm dūn”, meaning "the hill of gorse". 2) The English “Brendan” is an Anglicized form of the Irish “Breandán”. This Irish name is derived from the Old Irish “Brénainn”, a personal name (pronounced “br'ēn-in'”), which is in turn derived from a borrowing of the Welsh language word “breenhín”, meaning "a prince".