The baby name guesser can be a useful tool in suggesting names for a new baby, or finding out how popular a first name really is. Read what people are saying about Baby Name Guesser. Based on popular usage, it is 10.259 times more common for Brendan to be a boy's name. The popularity of Brendan is: 4.981. (where 0 = extremely rare, 6 = super popular) Listing of some deceased famous people named Brendan: