Sincere is a distinctive boys' name in United States, ranking #642 in 2010 with 377 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,285.7%. In 2010, approximately 1 in every 5,089 boys born was named Sincere. STABLE Recent data shows the name is currently stable.