Kaja is a distinctive girls' name in United States, ranking #5395 in 2000 with 21 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 110.0%. In 2000, approximately 1 in every 86,475 girls born was named Kaja. FALLING Recent data shows the name is currently falling.