Caio
Caio was given to 35 boys in 2025, #3,321 among boys’ names; 722 Americans have been recorded with it since 1990 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Caio by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
What does Caio mean?
Wiktionary, Spanish section
Caio is “a male given name, equivalent to English Gaius”
From Latin Caius, variant of Gaius.
/ˈkajo/
Meaning: Wiktionary, Spanish section, as of Sep 25, 2026 (CC BY‑SA 4.0).
How popular is Caio?
#3,321 among boys’ names, 2025
Caio rose from #4,309 in 2015 to #3,321 in 2025 among boys’ names; its share of boys born rose from 12.0 to 20.5 per million.
40 babies in 2023, the peak
Caio peaked in 2023, when 40 boys were given it, #3,065 among boys’ names. The 35 births of 2025 are 88% of that peak.
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 2025 | 35 | #3,321 | 20.5 |
| 2024 | 30 | #3,706 | 17.4 |
| 2023 | 40 | #3,065 | 23.4 |
| 2022 | 29 | #3,784 | 16.6 |
| 2021 | 32 | #3,507 | 18.3 |
| 2020 | 24 | #4,156 | 13.9 |
| 2019 | 34 | #3,356 | 18.9 |
| 2018 | 32 | #3,453 | 17.6 |
| 2017 | 24 | #4,238 | 13.0 |
| 2016 | 11 | #7,211 | 5.8 |
Every recorded year (36)
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 2015 | 23 | #4,309 | 12.0 |
| 2014 | 21 | #4,553 | 10.9 |
| 2013 | 29 | #3,590 | 15.3 |
| 2012 | 25 | #4,022 | 13.2 |
| 2011 | 21 | #4,528 | 11.1 |
| 2010 | 30 | #3,544 | 15.6 |
| 2009 | 31 | #3,483 | 15.6 |
| 2008 | 31 | #3,494 | 15.2 |
| 2007 | 32 | #3,383 | 15.4 |
| 2006 | 28 | #3,611 | 13.6 |
| 2005 | 23 | #3,953 | 11.5 |
| 2004 | 16 | #5,041 | 8.1 |
| 2003 | 15 | #5,066 | 7.6 |
| 2002 | 16 | #4,726 | 8.2 |
| 2001 | 6 | #9,423 | 3.1 |
| 2000 | 11 | #5,960 | 5.6 |
| 1999 | 12 | #5,349 | 6.2 |
| 1998 | 7 | #7,663 | 3.7 |
| 1997 | 5 | #9,460 | 2.7 |
| 1996 | 7 | #7,235 | 3.7 |
| 1995 | 11 | #5,164 | 5.8 |
| 1994 | 6 | #7,895 | 3.1 |
| 1993 | 8 | #6,285 | 4.1 |
| 1992 | 6 | #7,534 | 3.0 |
| 1991 | 5 | #8,359 | 2.5 |
| 1990 | 6 | #7,290 | 2.9 |
Ranks and shares: boys’ names in each year’s SSA file; share of all boys SSA recorded that year.
Is Caio a boy’s or a girl’s name?
Caio has been recorded only for boys: SSA lists no girls with the name in 36 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Caio: the SSA national file counts each sex separately.
How many people are named Caio, and how old are they?
An estimated 713 Americans named Caio and born in the U.S. are alive in 2026 (99% of everyone recorded); the median is 13 years old and half are between 6 and 20. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 1,308 people named Caio (9 women and girls, 1,299 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 532 born in the U.S. The Census count is 2.5 times that prediction. Possible reasons: the Census counts people born abroad, whom SSA’s files leave out, and it records the name people give, which SSA may have recorded under another spelling or as part of a compound name.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Names spelled alike
Of these 8 names spelled alike, given to 83,361 babies since 1880, Caio is the third most given (<1% of them). In 2025 it was given to 35 of their 4,167 babies (<1%), again the third most given.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Caio
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Caio and names like it
- Compare Caio and KaiBirths, ranks, peak and the living estimate side by side.
- The most given names of the 2020sCaio peaked in 2023.
- Massachusetts’s most given namesThe state where SSA recorded the most babies named Caio since 1910.
- Spanish namesWiktionary’s origin for Caio: every such name, by how often it is given.
- The top names of 2023The year the most babies were named Caio.
- The names of Generation AlphaMost people named Caio alive today were born 2013-2025.
- Names starting with CMost given first.