"rejoice, delight"
Origin: Latin via Welsh
Language: Welsh
Cai
Pronunciation: [ k-EYE ]
Does Cai flow with your last name?
A crisp Welsh name worn by an Arthurian knight
Welsh
Chinese
English
Minimalist
Modern
Bold
Unique
Reviewed by the NamingEverything Editorial Team · Updated
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Same sound, same style — different options
Meaning & Origin
"talent, colorful"
Origin: Chinese
Language: Chinese
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The Story of Cai
Cai is the Welsh form of Kay, itself the Arthurian knight Sir Kay (Cai in Welsh legend), King Arthur's foster brother and seneschal. In Welsh, Cai is thought to relate to the Latin Caius or Gaius, a Roman praenomen meaning 'rejoice.' Simultaneously, Cai exists as a Chinese given name (才 meaning talent, or 彩 meaning colorful) bringing entirely different cultural meaning.
As a Welsh variant of the popular Kai, Cai appeals to parents wanting a minimalist, strong one-syllable name with genuine cultural depth. Kai has ranked in top baby name lists across English-speaking countries since 2010.
In Welsh Arthurian legend, Sir Cai (Kay) is one of Arthur's most loyal companions, depicted as brave and occasionally sharp-tongued. In Chinese culture, Cai as a surname (蔡) is one of the most common Chinese family names.
Historical Record
Cai first appeared in US Social Security records in 1989.
Over 1,381 babies have been named Cai in the United States since SSA records began.
Today, Cai is a hidden gem — rare but distinctive , currently ranked #1,906 for boy names in the US .
Fun Facts
- Sir Cai (Kay) appears in the earliest Welsh Arthurian texts, predating the French romances by centuries
- Cai is among the shortest possible given names used in Wales
Cai in Other Languages
Latin
Caius
Welsh
Cai
Chinese
才/彩
Arthurian
Kay
Popularity Over Time
#1,906
Current Rank
Rising
Trend
Hidden Gem
Based on SSA data 1880–present
Year-by-year popularity data will be available soon.
Famous People Named Cai
C
Cai Guo-Qiang
Artist
1957
Chinese contemporary artist known for explosive gunpowder installations
S
Sir Cai (Kay) Fictional
Other
King Arthur's seneschal and foster brother in Welsh and Arthurian legend
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Compare Cai with:
Quick Facts
- Gender
- Boy
- Syllables
- 1
- Popularity Rank
- #1,906
- Total SSA Count
- 83
- Cultural Origins
- Welsh Chinese English
- Pronunciation
- Moderate
- Formality
- Casual
- Cross-Cultural Ease
- Moderate
Alternative Spellings
Middle Name Ideas
Suggested pairings based on syllable flow and style
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Classic pairing, smooth 1-2 syllable flow
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Classic pairing, smooth 1-2 syllable flow
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Timeless choice, English heritage match, quick 1-1 syllable combo
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Classic pairing, smooth 1-2 syllable flow
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Timeless choice, English heritage match, quick 1-1 syllable combo
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Timeless choice, English heritage match, quick 1-1 syllable combo
-
Classic pairing, smooth 1-2 syllable flow
-
Classic pairing, smooth 1-2 syllable flow
-
Classic pairing, smooth 1-2 syllable flow
-
Timeless choice, English heritage match, quick 1-1 syllable combo
Middle Names
Middle Names for Cai
6 name pairings with syllable flow tips
Sibling Names
Sibling Match
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Also a Girl Name
Cai is also used as a girl name, ranked #6440.
View Cai as a girl name →Similar Names
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Latin (Julius) origin
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Frequently Asked Questions About Cai
What does the name Cai mean?
"rejoice, delight" (from Latin via Welsh). "talent, colorful" (from Chinese). Cai is the Welsh form of Kay, itself the Arthurian knight Sir Kay (Cai in Welsh legend), King Arthur's foster brother and seneschal. In Welsh, Cai is thought to relate to the Latin Caius or Gaius, a Roman praenomen meaning 'rejoice.' Simultaneously, Cai exists as a Chinese given name (才 meaning talent, or 彩 meaning colorful) bringing entirely different cultural meaning.
What is the origin of the name Cai?
Cai has Latin via Welsh, Chinese, Welsh, and English origins. In Latin via Welsh, it means "rejoice, delight". In Chinese, it means "talent, colorful".
Is Cai a boy or girl name?
Cai is used as both a boy and girl name. As a boy name, it is ranked #1906. As a girl name, it is ranked #6440. Cai is more commonly used as a boy name.
How do you pronounce Cai?
Cai is pronounced k-EYE.
How popular is the name Cai?
Cai is currently ranked #1906 in popularity for boy names in the United States.
What are good middle names for Cai?
Popular middle name pairings include Cai James, Cai River, Cai Alexander, Cai Thomas, Cai Owen, and Cai Finn.
What are good sibling names for Cai?
Names that pair well with Cai as siblings include Nia, Rhys, Lena, Beau, Seren, and Eli.
How many syllables does Cai have?
Cai has 1 syllable, making it easy to say and remember.
Is Cai a common or rare name?
Cai is an uncommon name, ranked #1906 in the US. Its rarity gives it a distinctive, memorable quality.
What boy names are similar to Cai?
About the Name Cai
Cai is a boy name with Welsh, Chinese, and English origins . The name means "rejoice, delight" in Latin via Welsh .
Is Cai a boy or girl name? Cai is used as both a boy and girl name. As a boy name, it ranks #1,906 in popularity. As a girl name, it ranks #6,440. Cai is more commonly used as a boy name.
Cai is currently ranked #1,906 in popularity for boy names in the United States.
The name Cai has 1 syllable and is pronounced k-EYE, making it easy to pronounce and remember.
Alternative spellings of Cai include Cairo, Caiden, Cain, Caius, Caine . Each spelling variation gives the name a slightly different character while preserving its sound and meaning.
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Sources
- U.S. Social Security Administration — National Baby Names Data (popularity rankings and historical trends)
- Behind the Name (etymology and meaning research)
- NamingEverything editorial research and analysis