Sincere is a distinctive boys' name in United States, ranking #642 in 2006 with 363 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,085.7%. In 2006, approximately 1 in every 5,661 boys born was named Sincere. STABLE Recent data shows the name is currently stable.