What does the name Brennan mean? The meaning of the name Brennan is Tear, Sorrow. The origin of the name Brennan is Irish. This is the culture in which the name originated, or in the case of a word, the language.
Alternate spellings: Brennen
People who like the name Brennan also like: Liam
, Caleb Charlotte
Name Notes: Diminutive of the Irish word, Braon.