brannigan · noun1
Bran(n)- refers to an ancient king of Wales, his name meaning "raven" in Old Welsh. His head is said to be buried under the Tower of London & is why, it is said, that ravens flock to it. "-igan" is an Anglicization of the Brythonic Gaelic surname suffix "-yggan" which means "descendant of".
Brannigan · proper noun2
- Irish · derived fromÓ Branagáin“descendant of Branagán”
- English todayBrannigan
Reduced Anglicized form of Irish Ó Branagáin (“descendant of Branagán”), a personal name derived from a hypocoristic form of bran (“raven”).
Etymology from Wiktionary, CC BY-SA 4.0.