Cynthia is a moderately popular girls' name in United States, ranking #117 in 1997 with 2,714 recorded births. The name reached its all-time peak in 1996 with 3,189 births ranking #101. Since 1996, the popularity has decreased by 14.9%. In 1997, approximately 1 in every 641 girls born was named Cynthia. FALLING Recent data shows the name is currently falling.