Sincere is a distinctive boys' name in United States, ranking #849 in 2000 with 189 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 2,600.0%. In 2000, approximately 1 in every 10,391 boys born was named Sincere. STABLE Recent data shows the name is currently stable.