Spelling Variants
Brennan vs Brennen: Which Spelling?
Brennan and Brennen are Anglicized forms of the same Irish surname.
Global Rank #703
Brennan
Origin: English
The given name Brennan is an Anglicized form of the Irish Gaelic surname Ó Braonáin, meaning "descendant of Braonán," where Braonán is a personal name derived from *braon* meaning "sorrow"…
Global Rank #4,789
Brennen
Origin: Ireland
The given name 'Brennen' is an Anglicized form of the Irish surname Ó Braonáin, meaning "descendant of Braonán," where Braonán itself derives from the Old Irish word *braon* meaning "moisture,"…
Which is more popular? Based on real registry rankings, Brennan currently ranks higher globally. Popularity can vary a lot by country — check each name's own page for a full regional breakdown.