Brook is a distinctive boys' name in United States, ranking #5103 in 2006 with 17 recorded births. The name reached its all-time peak in 1997 with 47 births ranking #1933. Since 1996, the popularity has decreased by 58.5%. In 2006, approximately 1 in every 120,889 boys born was named Brook. FALLING Recent data shows the name is currently falling.