Sinthia is a distinctive girls' name in United States, ranking #7359 in 2007 with 18 recorded births. This places Sinthia in the top 36% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2000 with 19 births ranking #5910. Since 1996, the popularity has increased by 80.0%. In 2007, approximately 1 in every 106,803 girls born was named Sinthia. FALLING Recent data shows the name is currently falling.