Brennen is a distinctive boys' name in United States, ranking #534 in 1998 with 378 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 48.8%. In 1998, approximately 1 in every 5,056 boys born was named Brennen. FALLING Recent data shows the name is currently falling.