"rejoice"
Origin: Welsh
Language: Welsh
Cai
Pronunciation: [ k-EYE ]
Does Cai flow with your last name?
One crisp syllable, two rich traditions
Welsh
Chinese
English
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Modern
Unique
Bold
Reviewed by the NamingEverything Editorial Team · Updated
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Meaning & Origin
"tortoise, ancient clan"
Origin: Chinese
Language: Chinese
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The Story of Cai
Cai has two distinct origins. In Welsh, it is a variant of the Arthurian knight Sir Kay (Latin: Caius), one of King Arthur's most loyal companions. In Chinese, Cai (蔡) is a surname meaning 'tortoise' or historically linked to the Cai state of ancient China. As a given name for girls, Cai is a modern gender-neutral choice riding the wave of short, crisp names.
Cai as a girl's name has grown alongside the trend of ultra-short, single-syllable names and gender-neutral naming. Its phonetic similarity to the popular Kai helps it feel both modern and grounded.
In Welsh tradition, Cai references the legendary Sir Kay of Arthurian legend. In Chinese culture, Cai is a common surname with ancient roots tied to a Zhou Dynasty vassal state.
Historical Record
Cai first appeared in US Social Security records in 1996.
Over 481 babies have been named Cai in the United States since SSA records began.
Today, Cai is a hidden gem — rare but distinctive , currently ranked #6,440 for girl names in the US .
Fun Facts
- Sir Cai (Kay) was one of King Arthur's first and most trusted knights in Welsh legend
- Cai is also a prominent Chinese surname borne by millions
Cai in Other Languages
Latin
Caius
Welsh
Cai
Chinese
蔡
Japanese
カイ
Popularity Over Time
#6,440
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
S
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Compare Cai with:
Quick Facts
- Gender
- Girl
- Syllables
- 1
- Popularity Rank
- #6,440
- Total SSA Count
- 18
- 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
-
Distinctive pick, English heritage match, quick 1-1 syllable combo
-
Timeless choice, Welsh 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
-
Distinctive pick, English heritage match, quick 1-1 syllable combo
Middle Names
Middle Names for Cai
7 name pairings with syllable flow tips
Sibling Names
Sibling Match
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Also a Boy Name
Cai is also used as a boy name, ranked #1906.
View Cai as a boy name →Similar Names
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Compare Cai with...
Same Origin Names (Welsh)
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Hawaiian origin
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Avaline
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Germanic avi via French Aveline origin
"strength, force"
#6,626 in US
Nelli
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Old French origin
"Diminutive form of Eleanor, bright an..."
#6,411 in US
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Hebrew via English origin
"gift of Yahweh"
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"God is my strength"
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Old Irish Ciar origin
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Frequently Asked Questions About Cai
What does the name Cai mean?
"rejoice" (from Welsh). "tortoise, ancient clan" (from Chinese). Cai has two distinct origins. In Welsh, it is a variant of the Arthurian knight Sir Kay (Latin: Caius), one of King Arthur's most loyal companions. In Chinese, Cai (蔡) is a surname meaning 'tortoise' or historically linked to the Cai state of ancient China. As a given name for girls, Cai is a modern gender-neutral choice riding the wave of short, crisp names.
What is the origin of the name Cai?
Cai has Welsh, Chinese, and English origins. In Welsh, it means "rejoice". In Chinese, it means "tortoise, ancient clan".
Is Cai a boy or girl name?
Cai is used as both a girl and boy name. As a girl name, it is ranked #6440. As a boy name, it is ranked #1906. 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 #6440 in popularity for girl names in the United States.
What are good middle names for Cai?
Popular middle name pairings include Cai Rose, Cai Marie, Cai Lynn, Cai Elizabeth, Cai Anne, Cai Grace, and Cai Jade.
What are good sibling names for Cai?
Names that pair well with Cai as siblings include Kai, Zoe, Ivy, Leo, Ren, and Piper.
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 #6440 in the US. Its rarity gives it a distinctive, memorable quality.
What girl names are similar to Cai?
About the Name Cai
Cai is a girl name with Welsh, Chinese, and English origins . The name means "rejoice" in Welsh .
Is Cai a boy or girl name? Cai is used as both a girl and boy name. As a girl name, it ranks #6,440 in popularity. As a boy name, it ranks #1,906. Cai is more commonly used as a boy name.
Cai is currently ranked #6,440 in popularity for girl 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 Caitlin, Caia, Caitlyn, Cailyn, Cairo . 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