Kei vs Casyn

Baby Name Comparison — 2026

Kei

Boy #4,606 Most Popular 1 Syllable

"joy, jubilation"

Origin: Japanese kanji 慶

Japanese American Hawaiian

✓ All Clear

Boy #4,583 Most Popular 2 Syllables

"vigilant, watchful"

Origin: Irish Gaelic

American Irish English

✓ All Clear

Kei Rank #4,606

Casyn Rank #4,583

Casyn is more popular, ranked #4583 vs #4606 for Kei.

Is Kei or Casyn more popular?

Casyn is more popular, ranked #4583 compared to Kei at #4606 in the United States.

What do Kei and Casyn mean?

Kei means "joy, jubilation" (Japanese kanji 慶 origin). Casyn means "vigilant, watchful" (Irish Gaelic origin).

Are Kei and Casyn boy or girl names?

Kei is primarily a boy name. Casyn is primarily a boy name.