Rein is a distinctive boys' name in United States, ranking #7197 in 2023 with 12 recorded births. This places Rein in the bottom 49% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2024 with 14 births ranking #6383. In 2023, approximately 1 in every 142,379 boys born was named Rein. FALLING Recent data shows the name is currently falling.