Kaja is a distinctive girls' name in United States, ranking #7115 in 2015 with 17 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 70.0%. In 2015, approximately 1 in every 104,980 girls born was named Kaja. FALLING Recent data shows the name is currently falling.