Caius
- US rank
- #927
- Syllables
- 2
- Peak
- #927 in 2025
254 babies were named Caius in the US in 2025. It has climbed 282 places in five years.
Found on lists
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US births per million boys, 1994–2025
Most popular states (2025)
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Caius you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 6,725 baby boys born in the US in 2025 was named Caius, 254 babies in all. In a typical school of 500 kids, your Caius would very likely be the only one.
- HistoryCaius first shows up in US birth records in 1994, the first year at least 5 babies got it. It has been in use for 31 years since.
- Best yearCaius is at its all-time high right now: #927 in 2025.
- Then vs nowCaius is 29× more common today than it was in 2000. In 2000 it was given to about 1 in 196,078 baby boys; in 2025, about 1 in 6,725.
- TrendCaius has climbed 282 places in the US rankings over the last five years and now sits at #927. Fast risers like this often keep climbing, so expect to hear it more.
- Where it's lovedCaius is most popular in Maryland, where it ranks #571, followed by Minnesota (#586) and Indiana (#621). It's in the top 1,000 in 16 states.
About the name Caius
Caius is a boy name of Latin and Welsh origin. It has 5 letters and 2 syllables, starting with C and ending in “-ius”. US birth records list Caius for boys from 1994 to 2025, in 28 of those 32 years. Its best year was 2025, when it ranked #927 among boy names. In 2025 it ranked #927, with 254 babies.
Origin:Latin namesWelsh names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1990s | 1.0 | 967,742 boys |
| 2000s | 10 | 97,656 boys |
| 2010s | 57 | 17,547 boys |
| 2020s | 101 | 9,912 boys |
Other spellings of Caius
More Latin boy names
- Boy name: Oliver · olive tree
- Boy name: Theodore · gift of God
- Boy name: Lucas · man from Lucania
- Unisex name: Elias · my God is Yahweh
- Unisex name: Luca · man from Lucania
- Boy name: Sebastian · venerable
- Boy name: Leo · lion
- Boy name: Alexander · defender of men
Questions about the name Caius
What is the origin of the name Caius?
Caius has Latin, Welsh roots in our records. Other Latin names include Oliver, Theodore, Lucas.
Is Caius a boy or girl name?
Caius is a boy name.
How popular is the name Caius?
Caius ranked #927 for US boys in 2025, given to 254 babies. Its best year was 2025 (#927).