Kourtney is a distinctive girls' name in United States, ranking #646 in 2010 with 459 recorded births. The name reached its all-time peak in 1996 with 594 births ranking #429. Since 1996, the popularity has decreased by 22.7%. In 2010, approximately 1 in every 3,872 girls born was named Kourtney. FALLING Recent data shows the name is currently falling.