Kaja is a distinctive girls' name in United States, ranking #6054 in 2010 with 22 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 120.0%. In 2010, approximately 1 in every 80,788 girls born was named Kaja. FALLING Recent data shows the name is currently falling.