In 2025, 35 US boys were named Rei, making it the 3,363rd most common boys’ name of the year, up 511 places from #3,874 in 2024. That is 6 more than the 29 boys named Rei in 2024. Its best rank for boys was #3,363, reached in this year, 2025. That year also had the most boys given the name: 35. For comparison, it was #4,673 in 2015 and unranked in 1950.
In 2025, 24 US girls were named Rei, making it the 5,364th most common girls’ name of the year, down 367 places from #4,997 in 2024. That is 3 fewer than the 27 girls named Rei in 2024. Its best rank for girls was #3,269, reached in 2020. That year also had the most girls given the name: 48. For comparison, it was #8,844 in 2015 and unranked in 1950.
Social Security card records list Rei in 37 years of the 146 from 1880 to 2025, starting in 1974 with 5 babies. In all, 1,028 US babies have been given the name, 54% of them girls and 46% boys. Its busiest decade was the 2010s, with 384 babies named Rei.
Over the 10 years from 2016 to 2025, 246 US boys were named Rei; the busiest of those years was 2025, with 35. In 2025 that was about 1 in 48,802 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Rey (10,222 babies since 1880), Rio (7,812 babies since 1880), Ria (4,115 babies since 1880) and Reya (2,939 babies since 1880). Rarer spellings such as Reigh are summarised on this page.