Casia is a distinctive girls' name in United States, ranking #11511 in 2003 with 8 recorded births. The name reached its all-time peak in 2008 with 17 births ranking #7479. Since 1996, the popularity has decreased by 11.1%. In 2003, approximately 1 in every 228,381 girls born was named Casia. FALLING Recent data shows the name is currently falling.