Sincere is a distinctive boys' name in United States, ranking #718 in 2008 with 324 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 4,528.6%. In 2008, approximately 1 in every 6,296 boys born was named Sincere. STABLE Recent data shows the name is currently stable.