Brennan vs Billy

Baby Name Comparison — 2026

Brennan

Boy #1,058 Most Popular 2 Syllables

"descendant of Braonán, tearful one"

Origin: Irish Gaelic

Irish American Scottish

✓ All Clear

Boy #1,051 Most Popular 2 Syllables

"resolute protector"

Origin: Old German via Norman French

English American Australian Irish

✓ All Clear

Brennan Rank #1,058

Billy Rank #1,051

Billy is more popular, ranked #1051 vs #1058 for Brennan.

Is Brennan or Billy more popular?

Billy is more popular, ranked #1051 compared to Brennan at #1058 in the United States.

What do Brennan and Billy mean?

Brennan means "descendant of Braonán, tearful one" (Irish Gaelic origin). Billy means "resolute protector" (Old German via Norman French origin).

Are Brennan and Billy boy or girl names?

Brennan is primarily a boy name. Billy is primarily a boy name.