Kou is a distinctive boys' name in United States, ranking #7993 in 2001 with 8 recorded births. The name reached its all-time peak in 1996 with 22 births ranking #3258. Since 1996, the popularity has decreased by 63.6%. In 2001, approximately 1 in every 242,854 boys born was named Kou. FALLING Recent data shows the name is currently falling.