Reinier is a distinctive boys' name in United States, ranking #13456 in 2025 with 5 recorded births. This places Reinier in the bottom 3% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 8 births ranking #9573. In 2025, approximately 1 in every 341,615 boys born was named Reinier. FALLING Recent data shows the name is currently falling.