Brennan is a distinctive boys' name in United States, ranking #1054 in 2024 with 207 recorded births. The name reached its all-time peak in 2009 with 1,464 births ranking #242. Since 1996, the popularity has decreased by 76.9%. In 2024, approximately 1 in every 8,287 boys born was named Brennan. STABLE Recent data shows the name is currently stable.