Sincere is a distinctive boys' name in United States, ranking #781 in 2001 with 217 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 3,000.0%. In 2001, approximately 1 in every 8,953 boys born was named Sincere. STABLE Recent data shows the name is currently stable.