Rei
Boy name · #3347 in 2025 · Very rare
How old is the name Rei? In official American birth records, Rei has been tracked continuously since 1987, giving it 38 years of documented American history.
In 2025, 35 baby boys were named Rei, placing it at #3347 in the official national rankings. A decade ago it stood at #4545, so the name has been rising over the past ten years. Roughly one in every 51,429 boys born in 2025 was named Rei.
Babies named Rei per year. Source: Official national birth records.
The 38-year story
Rei first appears in the Social Security records in 1987, when 5 boys received the name. Its all-time peak is essentially right now: 2025, with 35 babies and a rank of #3314. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Rei against up to 5 other names.
Uniqueness: will there be another Rei in class?
On our rarity read — which blends how common Rei is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Rei will likely be the only one in the room, with the occasional spelling-out as the price.
Where Rei is most common
State-level data for Rei is too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
Names like Rei
Statistically, parents drawn to Rei tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Roi, Rafi, Rai, Rui, and Ramari.
Rank history (last 25 years)
| Year | Babies named Rei | Rank |
|---|---|---|
| 2025 | 35 | #3314 |
| 2024 | 29 | #3793 |
| 2023 | 19 | #5075 |
| 2022 | 19 | #5019 |
| 2021 | 34 | #3362 |
| 2020 | 16 | #5451 |
| 2019 | 30 | #3636 |
| 2018 | 28 | #3793 |
| 2017 | 22 | #4466 |
| 2016 | 14 | #6053 |
| 2015 | 21 | #4545 |
| 2014 | 9 | #8130 |
| 2013 | 6 | #10728 |
| 2012 | 8 | #8864 |
| 2011 | 14 | #5945 |
| 2010 | 15 | #5741 |
| 2009 | 13 | #6436 |
| 2008 | 21 | #4540 |
| 2007 | 14 | #5901 |
| 2006 | 8 | #8732 |
| 2005 | 8 | #8299 |
| 2004 | 13 | #5813 |
| 2003 | 16 | #4815 |
| 2002 | 12 | #5725 |
| 2001 | 8 | #7536 |
Frequently asked questions
How old is the name Rei?
In official American birth records, the name Rei first appeared in 1987 (over 38 years ago), when 5 newborn boys received the name. It has been tracked in modern national records for 38 years.
Is Rei a popular boy name?
Rei ranked #3347 among boys in 2025 with 35 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #4545.
When was the name Rei most popular?
Rei peaked in 2025, when 35 American boys received the name (ranked #3314 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Rei?
In 2025, roughly 1 in 51,429 newborn American boys was named Rei. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.