Sinthia is a distinctive girls' name in United States, ranking #6129 in 1997 with 16 recorded births. The name reached its all-time peak in 2000 with 19 births ranking #5910. Since 1996, the popularity has increased by 60.0%. In 1997, approximately 1 in every 108,791 girls born was named Sinthia. FALLING Recent data shows the name is currently falling.