Brennen is a distinctive boys' name in United States, ranking #740 in 2011 with 306 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 20.5%. In 2011, approximately 1 in every 6,206 boys born was named Brennen. FALLING Recent data shows the name is currently falling.