Brennan is a distinctive boys' name in United States, ranking #995 in 2022 with 224 recorded births. The name reached its all-time peak in 2009 with 1,464 births ranking #242. Since 1996, the popularity has decreased by 75.0%. In 2022, approximately 1 in every 7,787 boys born was named Brennan. STABLE Recent data shows the name is currently stable.