Kaja is a distinctive girls' name in United States, ranking #6318 in 1997 with 15 recorded births. The name reached its all-time peak in 2009 with 25 births ranking #5620. Since 1996, the popularity has increased by 50.0%. In 1997, approximately 1 in every 116,044 girls born was named Kaja. FALLING Recent data shows the name is currently falling.