Sincere is a distinctive boys' name in United States, ranking #660 in 2005 with 326 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 4,557.1%. In 2005, approximately 1 in every 6,126 boys born was named Sincere. STABLE Recent data shows the name is currently stable.