Brennen is a distinctive boys' name in United States, ranking #757 in 2012 with 302 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 18.9%. In 2012, approximately 1 in every 6,280 boys born was named Brennen. FALLING Recent data shows the name is currently falling.