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.
Diminutive of the Irish word, Braon.
Brennan is on 3,528 BN name lists Brennan is currently not ranked on the BN charts Brennan is currently #588 in U.S. births
Brennan 
