What does Brennan mean?
Brennan \b-rennan, br(en)-nan\ as a boys' name (also used less commonly as girls' name Brennan) is pronounced BREN-an. It is of Irish and Gaelic origin, and the meaning of Brennan is "teardrop". Variant of Brendan.
For more on this name, see also the related boy name Brandon.
Brennan has 1 feminine form: Brenna.
Brennan is a rare given name for males but a very popular surname for all people (#642 out of 150436, Top 1%). (2000 U.S. Census)
Charted below is the baby name popularity of Brennan for boys. Brennan was first listed in 1970-1979 and reached its highest position of #243 in the U.S. in the year 2009, and is at #386 presently. (2014 Birth Statistics)
Prominent variation forms of Brennan (#386 in 2014) appearing in the Top 1000 are Brandon (#71 in 2014), Brendan (#351), Brenden (#711), Brendon, Brennen and Brennon. These boy names reached the peak of their popularity in the year 1998 (usage of 0.661%) and have become much less widespread since (usage 0.3544%, down 46.4%), with the versions Brenden, Brendon and Brennen becoming less in vogue. Brandon (#71), Brendan (#351) and Brennan (#386) are three of the more chic birth names in this compilation. Below is a charted analysis of the popularity of the boy name Brennan and associated names. (2014 Birth Statistics)