Kourtney is a distinctive girls' name in United States, ranking #680 in 2000 with 353 recorded births. The name reached its all-time peak in 1996 with 594 births ranking #429. Since 1996, the popularity has decreased by 40.6%. In 2000, approximately 1 in every 5,144 girls born was named Kourtney. FALLING Recent data shows the name is currently falling.