The name Brenna is a girl's name of Irish origin meaning "descendant of the sad one". Brenna is ranked #909 on our popularity charts and is often added to lists like Irish Baby Names for Girls and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Brenna is a feminine form of the Irish surname Brennan, or perhaps a variation of Brenda or Brendan—all of which have different meanings. Whatever its derivation or authenticity, it's a modern sounding name which has steadily decreased in popularity since 1995 when it peaked at Number 235 in the United States.
Brenna O'Brien is a Canadian actress.