Meaning and name origin
Brennan \b-rennan, br(en)-nan\ as a boy's name (also used as girl's 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 information, see also the related boy name Brandon.
There is 1 feminine form of Brennan: Brenna.
Brennan is not a popular first name for males but a very popular surname or last name for all people (#744 out of 88799, Top 1%) (Source: 2000 U.S. Population Census).
Displayed below is the baby name popularity of the name Brennan for boys. Brennan reached its highest rank of #243 in the U.S. in 2009 (Source: 2014 Birth Name Statistics).
Displayed below is a comparison of the popularity of the boy name Brennan and its variant forms. Popular variation forms ranked in the Top 1000/100 are Brandon (#71), Brendan (#351), Brennan (#386), Brennon and Brennen. (Source: 2014 Birth Name Statistics).