Brennen is a distinctive boys' name in United States, ranking #656 in 1996 with 254 recorded births. This places Brennen in the top 6% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2009 with 455 births ranking #580. In 1996, approximately 1 in every 7,458 boys born was named Brennen. FALLING Recent data shows the name is currently falling.