Brennen is a distinctive boys' name in United States, ranking #571 in 2001 with 362 recorded births. The name reached its all-time peak in 2009 with 455 births ranking #580. Since 1996, the popularity has increased by 42.5%. In 2001, approximately 1 in every 5,367 boys born was named Brennen. FALLING Recent data shows the name is currently falling.