Cai vs Sir

Baby Name Comparison — 2026

Cai

Boy #1,906 Most Popular 1 Syllable

"rejoice, delight"

Origin: Latin via Welsh

Welsh Chinese English

✓ All Clear

Boy #1,964 Most Popular 1 Syllable

"lord, master"

Origin: Old French

American English Caribbean

✓ All Clear

Cai Rank #1,906

Sir Rank #1,964

Cai is more popular, ranked #1906 vs #1964 for Sir.

Is Cai or Sir more popular?

Cai is more popular, ranked #1906 compared to Sir at #1964 in the United States.

What do Cai and Sir mean?

Cai means "rejoice, delight" (Latin via Welsh origin). Sir means "lord, master" (Old French origin).

Are Cai and Sir boy or girl names?

Cai is primarily a boy name. Sir is primarily a boy name.