Brennen is a distinctive boys' name in United States, ranking #626 in 2004 with 337 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 32.7%. In 2004, approximately 1 in every 5,890 boys born was named Brennen. FALLING Recent data shows the name is currently falling.