Casia is a distinctive girls' name in United States, ranking #15334 in 2010 with 6 recorded births. The name reached its all-time peak in 2008 with 17 births ranking #7479. Since 1996, the popularity has decreased by 33.3%. In 2010, approximately 1 in every 296,221 girls born was named Casia. FALLING Recent data shows the name is currently falling.