Sincere is a distinctive boys' name in United States, ranking #701 in 2009 with 344 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 4,814.3%. In 2009, approximately 1 in every 5,765 boys born was named Sincere. STABLE Recent data shows the name is currently stable.