Kou is a distinctive boys' name in United States, ranking #8594 in 2004 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 2004, approximately 1 in every 248,100 boys born was named Kou. FALLING Recent data shows the name is currently falling.