The name Brenna is a girl's name of Irish origin meaning "descendant of the sad one". Brenna is ranked #994 on our popularity charts and is often added to lists like Irish Baby Names for Girls and discussed in our forums with posts like "Book Title Family Name Game".
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.