Brannan is a distinctive boys' name in United States, ranking #5509 in 1998 with 11 recorded births. This places Brannan in the top 49% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1997 with 15 births ranking #4269. Since 1996, the popularity has decreased by 15.4%. In 1998, approximately 1 in every 173,756 boys born was named Brannan. STABLE Recent data shows the name is currently stable.