Kaja is a distinctive girls' name in United States, ranking #5688 in 1998 with 18 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 80.0%. In 1998, approximately 1 in every 98,161 girls born was named Kaja. FALLING Recent data shows the name is currently falling.