Cynthia is a moderately popular girls' name in United States, ranking #176 in 2002 with 1,833 recorded births. The name reached its all-time peak in 1996 with 3,189 births ranking #101. Since 1996, the popularity has decreased by 42.5%. In 2002, approximately 1 in every 980 girls born was named Cynthia. FALLING Recent data shows the name is currently falling.