Sinclair is a distinctive boys' name in United States, ranking #5140 in 1996 with 12 recorded births. This places Sinclair in the top 49% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 14 births ranking #6400. In 1996, approximately 1 in every 157,853 boys born was named Sinclair. RISING Recent data shows the name is currently rising.