Kourtney is a distinctive girls' name in United States, ranking #840 in 2009 with 333 recorded births. The name reached its all-time peak in 1996 with 594 births ranking #429. Since 1996, the popularity has decreased by 43.9%. In 2009, approximately 1 in every 5,516 girls born was named Kourtney. FALLING Recent data shows the name is currently falling.