Fun Facts About the Name Caio
- 722 babies named Caio: U.S. records list 722 babies given the name Caio from 1880 through 2025.
What Does the Name Caio Mean?
Caio is the Italian and Portuguese form of the Latin Gaius, a Roman personal name (praenomen), and it is usually glossed as "rejoice" or "one who rejoices." That meaning rests on the traditional connection between Gaius and the Latin verb gaudere, "to rejoice." The link is customary rather than proven: the deeper origin of Gaius is debated, and some scholars have proposed an Etruscan source instead of a Latin one. The Latin spelling is also found as Caius, and the name was so common in Rome that it was routinely abbreviated to the single letter C.
Caio Name History & Origins
Gaius was one of the most widely used Roman praenomina, which is why it appears so often as the abbreviation C. in Latin inscriptions and manuscripts; early Latin writing did not distinguish G from C. Prominent bearers include Gaius Marius, Gaius Julius Caesar, and Gaius Octavius, the future emperor Augustus. A second-century jurist known simply as Gaius wrote the Institutes, a foundational textbook of Roman law.
The name spread with early Christianity. The New Testament names several men called Gaius, including a companion of Paul from Derbe and a member of the church at Corinth; the brief letter 3 John is addressed to a Gaius.
Caio is the Italian and Portuguese adaptation of Latin Gaius or Caius, reshaped to fit those languages' spelling and sound patterns. Italian also uses Gaio, and Portuguese has both Caio and Gaio. In English, the classical form is usually written Caius.
Caio is not related to the Italian greeting ciao, which comes from a Venetian word for "slave" and developed separately. It is also distinct from unrelated names that merely look similar.
How Popular is the Name Caio?
Caio has historically been an exceptionally rare given name in the United States, remaining well outside the national mainstream. It saw its highest recorded annual births in 2023. Its best rank was #3,063 in 2023.
U.S. name popularity from 1880-2025, based on SSA data. Rank shows how the name compares with other names - lower numbers mean greater popularity. Births shows how many babies received the name each year.
| Year | Rank | Births | % |
|---|---|---|---|
| 2025 | #3,322 | 35 | 0.0020% |
| 2024 | #3,695 | 30 | 0.0017% |
| 2023 | #3,063 | 40 | 0.0023% |
| 2022 | #3,786 | 29 | 0.0017% |
| 2021 | #3,507 | 32 | 0.0018% |
| 2020 | #4,160 | 24 | 0.0014% |
| 2019 | #3,357 | 34 | 0.0019% |
| 2018 | #3,457 | 32 | 0.0018% |
| 2017 | #4,241 | 24 | 0.0013% |
| 2016 | #7,214 | 11 | 0.0006% |
| 2015 | #4,311 | 23 | 0.0012% |
| 2014 | #4,556 | 21 | 0.0011% |
| 2013 | #3,592 | 29 | 0.0015% |
| 2012 | #4,025 | 25 | 0.0013% |
| 2011 | #4,528 | 21 | 0.0011% |
| 2010 | #3,544 | 30 | 0.0016% |
| 2009 | #3,484 | 31 | 0.0016% |
| 2008 | #3,497 | 31 | 0.0015% |
| 2007 | #3,385 | 32 | 0.0015% |
| 2006 | #3,613 | 28 | 0.0014% |
| 2005 | #3,956 | 23 | 0.0012% |
| 2004 | #5,044 | 16 | 0.0008% |
| 2003 | #5,070 | 15 | 0.0008% |
| 2002 | #4,732 | 16 | 0.0008% |
| 2001 | #9,430 | 6 | 0.0003% |
| 2000 | #5,968 | 11 | 0.0006% |
| 1999 | #5,355 | 12 | 0.0006% |
| 1998 | #7,671 | 7 | 0.0004% |
| 1997 | #9,466 | 5 | 0.0003% |
| 1996 | #7,243 | 7 | 0.0004% |
| 1995 | #5,170 | 11 | 0.0006% |
| 1994 | #7,901 | 6 | 0.0003% |
| 1993 | #6,290 | 8 | 0.0004% |
| 1992 | #7,541 | 6 | 0.0003% |
| 1991 | #8,367 | 5 | 0.0002% |
| 1990 | #7,298 | 6 | 0.0003% |
Name popularity over more than a century, based on Social Security Administration data. Gaps in the chart indicate years when the name does not appear in the published records.
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How the Name Caio Shapes Your Personality and Life?
You are cheerful and friendly, but are apt to have an emotional life. You like to have several lines of effort going at once. You are a good talker and promoter and seldom worry over anything. At times, you can be impatient, and impulsive. You have the ability to bring an idea to completion. You can express yourself joyously and constructively. You might be psychic, but not know it. You are bold, independent, inquisitive and interested in research. You know what you want and why you want it.
You are always looking for a chance to do your own thing, to be your own person, and to have things done your own way.
✦ Caio's Deeper Meaning & Tips for Parents Discover Caio's symbolic numbers and practical tips for choosing a name that complements your child's birth date.