Brennen is a distinctive boys' name in United States, ranking #659 in 2005 with 326 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 28.3%. In 2005, approximately 1 in every 6,126 boys born was named Brennen. FALLING Recent data shows the name is currently falling.