Sincere is a distinctive boys' name in United States, ranking #1071 in 1999 with 127 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 1,714.3%. In 1999, approximately 1 in every 15,119 boys born was named Sincere. STABLE Recent data shows the name is currently stable.