Brook is a distinctive boys' name in United States, ranking #4494 in 2005 with 19 recorded births. The name reached its all-time peak in 1997 with 47 births ranking #1933. Since 1996, the popularity has decreased by 53.7%. In 2005, approximately 1 in every 105,113 boys born was named Brook. FALLING Recent data shows the name is currently falling.