Sincere is a distinctive boys' name in United States, ranking #621 in 2007 with 397 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,571.4%. In 2007, approximately 1 in every 5,227 boys born was named Sincere. STABLE Recent data shows the name is currently stable.