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All over the world, Brennan (Brennan , ברנן , Бреннан ) is a common predominantly masculine, but scarcely girly first name. The first name Brennan is characteristic of Mongolia, where it is quite a common masculine name, the United States, where it is quite a rare predominantly male, but scarcely female name, and New Zealand. Not in comparison with a country's population, the name is most common in the United States, Mongolia, and Canada. More frequently, Brennan is the last name as well as the forename.
Brennan is also a name for the fictitious and mythical characters: Brennan Huff , the fictional human from the 2008 film Step Brothers.