Sinthia is a distinctive girls' name in United States, ranking #7768 in 2002 with 14 recorded births. The name reached its all-time peak in 2000 with 19 births ranking #5910. Since 1996, the popularity has increased by 40.0%. In 2002, approximately 1 in every 128,344 girls born was named Sinthia. FALLING Recent data shows the name is currently falling.