Sinthia is a distinctive girls' name in United States, ranking #7960 in 1998 with 12 recorded births. The name reached its all-time peak in 2000 with 19 births ranking #5910. Since 1996, the popularity has increased by 20.0%. In 1998, approximately 1 in every 147,241 girls born was named Sinthia. FALLING Recent data shows the name is currently falling.