Brook is a distinctive girls' name in United States, ranking #2909 in 2017 with 57 recorded births. This places Brook in the top 16% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 342 births ranking #675. Since 1996, the popularity has decreased by 81.7%. In 2017, approximately 1 in every 30,279 girls born was named Brook. STABLE Recent data shows the name is currently stable.