Rei is a distinctive girls' name in United States, ranking #8612 in 2004 with 13 recorded births. This places Rei in the top 46% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2020 with 48 births ranking #3267. In 2004, approximately 1 in every 141,240 girls born was named Rei. FALLING Recent data shows the name is currently falling.