Caius
In Latin, Caius is an archaic spelling of the Latin praenomen Gaius, pronounced /ga:ius/. In early Latin, the letter C was used for both /g/ and /k/; and the names Gaius and Gnaeus were spelt Caius and Cnaius and continued to be so in inscriptions, after the letter G was introduced, and C was confined to the /k/ sound. Notably, the name of Gaius Iulius Caesar is abbreviated CIC.
- Ancient Roman
Meaning & Origin of Caius
What this name means, where it came from, and how it has traveled across cultures.
In Latin, Caius is an archaic spelling of the Latin praenomen Gaius, pronounced /ga:ius/. In early Latin, the letter C was used for both /g/ and /k/; and the names Gaius and Gnaeus were spelt Caius and Cnaius and continued to be so in inscriptions, after the letter G was introduced, and C was confined to the /k/ sound. Notably, the name of Gaius Iulius Caesar is abbreviated CIC.
Source: Wikipedia (CC BY-SA 3.0). Read more →
Cultural Origins (via Behind the Name)
- Ancient Roman
The Story of Caius
The earliest SSA record of Caius as a baby boy name dates back to 1994, when 5 babies received it. 2024 was its biggest year on record, with 205 newborns named Caius — #1,059 in the national rankings. About 48% of every Caius on record arrived during the 2020s, its defining decade. As of 2026, Caius ranks #1,116 for baby boys with 193 births, rising sharply (+31% over the past five years). All told, over 2K Americans have carried the name since 1880, from the 1990s to the 2020s.
Popularity Over Time
Popularity by State
Variants & Related Forms of Caius
Foreign forms, alternate spellings, and nicknames that share roots with Caius. Linked entries have a profile on Peek a Name.
- Gaios
- Gaius
Names that sound like Caius
Phonetically similar names — useful when Caius is the vibe but a different syllable count or letter feel might suit better. Linked entries have a profile on Peek a Name.
Source: Datamuse . Phonetic similarity ranking, not curated.
Frequently Asked Questions about Caius
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About the name Caius
Caius is a boy baby name tracked by the U.S. Social Security Administration. It first appeared in SSA records in 1994 and has accumulated 2K births in the dataset. Caius's peak popularity came in 2024 when it ranked #1,059. Use the chart and map above to compare Caius's trajectory across years and U.S. states, or browse the related names section to discover similar choices.
Continue exploring
- Top names of 2024 →
- Names of the 2020s →
- Names starting with "C" →
- Browse all boy names →
- Top names of 2026 →
Data sources
- Birth statistics (counts, ranks, years 1880–2026) — U.S. Social Security Administration . Predictions for years not yet released by SSA are computed by Peek a Name from historical trends; we update with official data as soon as it ships.
- Etymology, cultural origins, and related forms — Behind the Name (used under their public API terms).
- Meaning prose and editorial summary — Wikipedia article extracts, licensed under CC BY-SA 3.0 .
- Predicted nationality distribution — Nationalize.io .
- Phonetically similar names — Datamuse .
Peek a Name aggregates and presents the above data for informational purposes. Statistical predictions and external attributions are clearly labelled where shown; we make no guarantee of accuracy beyond what each source provides.