Kou is a distinctive boys' name in United States, ranking #6302 in 1999 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 1999, approximately 1 in every 192,009 boys born was named Kou. FALLING Recent data shows the name is currently falling.