Kou is a distinctive boys' name in United States, ranking #7153 in 2000 with 9 recorded births. The name reached its all-time peak in 1996 with 22 births ranking #3258. Since 1996, the popularity has decreased by 59.1%. In 2000, approximately 1 in every 218,215 boys born was named Kou. FALLING Recent data shows the name is currently falling.