Caio
Boy name · #3349 in 2025 · Very rare
How old is the name Caio? In official American birth records, Caio has been tracked continuously since 1990, giving it 35 years of documented American history.
In 2025, 35 baby boys were named Caio, placing it at #3349 in the official national rankings. A decade ago it stood at #4295, so the name has been rising over the past ten years. Roughly one in every 51,429 boys born in 2025 was named Caio.
Babies named Caio per year. Source: Official national birth records.
The 35-year story
Caio first appears in the Social Security records in 1990, when 6 boys received the name. Its all-time peak is essentially right now: 2023, with 40 babies and a rank of #3055. 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 Caio against up to 5 other names.
Uniqueness: will there be another Caio in class?
On our rarity read — which blends how common Caio is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Caio will likely be the only one in the room, with the occasional spelling-out as the price.
Where Caio is most common
State-level data for Caio 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 Caio
Statistically, parents drawn to Caio tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Makaio, Akio, Neko, Cato, and Coda.
MakaioAkioNekoCatoCodaAmilioCalanMiko
Rank history (last 25 years)
| Year | Babies named Caio | Rank |
|---|---|---|
| 2025 | 35 | #3314 |
| 2024 | 30 | #3693 |
| 2023 | 40 | #3055 |
| 2022 | 29 | #3774 |
| 2021 | 32 | #3497 |
| 2020 | 24 | #4141 |
| 2019 | 34 | #3347 |
| 2018 | 32 | #3446 |
| 2017 | 24 | #4224 |
| 2016 | 11 | #7157 |
| 2015 | 23 | #4295 |
| 2014 | 21 | #4538 |
| 2013 | 29 | #3582 |
| 2012 | 25 | #4003 |
| 2011 | 21 | #4509 |
| 2010 | 30 | #3531 |
| 2009 | 31 | #3476 |
| 2008 | 31 | #3486 |
| 2007 | 32 | #3379 |
| 2006 | 28 | #3602 |
| 2005 | 23 | #3941 |
| 2004 | 16 | #5007 |
| 2003 | 15 | #5035 |
| 2002 | 16 | #4703 |
| 2001 | 6 | #9243 |
Frequently asked questions
How old is the name Caio?
In official American birth records, the name Caio first appeared in 1990 (over 35 years ago), when 6 newborn boys received the name. It has been tracked in modern national records for 35 years.
Is Caio a popular boy name?
Caio ranked #3349 among boys in 2025 with 35 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #4295.
When was the name Caio most popular?
Caio peaked in 2023, when 40 American boys received the name (ranked #3055 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Caio?
In 2025, roughly 1 in 51,429 newborn American boys was named Caio. 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.