Rainn is a distinctive boys' name in United States, ranking #4112 in 2025 with 26 recorded births. This places Rainn in the top 30% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2021 with 43 births ranking #2899. In 2025, approximately 1 in every 65,695 boys born was named Rainn. STABLE Recent data shows the name is currently stable.