Kaja is a distinctive girls' name in United States, ranking #7511 in 2001 with 14 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 40.0%. In 2001, approximately 1 in every 128,611 girls born was named Kaja. FALLING Recent data shows the name is currently falling.