Kou is a distinctive boys' name in United States, ranking #6826 in 2002 with 10 recorded births. The name reached its all-time peak in 1996 with 22 births ranking #3258. Since 1996, the popularity has decreased by 54.5%. In 2002, approximately 1 in every 194,147 boys born was named Kou. FALLING Recent data shows the name is currently falling.