Kourtney is a distinctive girls' name in England & Wales, ranking #743 in 2013 with 53 recorded births. The name reached its all-time peak in 2012 with 70 births ranking #600. Since 1996, the popularity has increased by 562.5%. In 2013, approximately 1 in every 5,820 girls born was named Kourtney. FALLING Recent data shows the name is currently falling.