Kaja is a distinctive girls' name in United States, ranking #5626 in 2006 with 24 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 140.0%. In 2006, approximately 1 in every 79,211 girls born was named Kaja. FALLING Recent data shows the name is currently falling.