Cynthia is a distinctive girls' name in United States, ranking #540 in 2015 with 580 recorded births. The name reached its all-time peak in 1996 with 3,189 births ranking #101. Since 1996, the popularity has decreased by 81.8%. In 2015, approximately 1 in every 3,077 girls born was named Cynthia. FALLING Recent data shows the name is currently falling.