Kaja is a distinctive girls' name in United States, ranking #5472 in 2012 with 25 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 150.0%. In 2012, approximately 1 in every 70,430 girls born was named Kaja. FALLING Recent data shows the name is currently falling.