Brennen is a distinctive boys' name in United States, ranking #574 in 1999 with 341 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 34.3%. In 1999, approximately 1 in every 5,631 boys born was named Brennen. FALLING Recent data shows the name is currently falling.