Casyn vs Siah

Baby Name Comparison — 2026

Casyn

Boy #4,583 Most Popular 2 Syllables

Meaning

"vigilant, watchful"

Origin: Irish Gaelic

Cultural Roots

American Irish English

Quick Stats

Popularity Rank
#4,583
Total SSA Count
22
Syllables
2
Formality
Casual
Nicknames
Cas, Casy, Ace

Playground Safety Score

✓ All Clear
Full profile for Casyn →

Siah

Boy #4,612 Most Popular 2 Syllables

Meaning

"God is salvation"

Origin: Hebrew

Cultural Roots

African-American Hebrew American

Quick Stats

Popularity Rank
#4,612
Total SSA Count
22
Syllables
2
Formality
Moderate
Nicknames
Si

Playground Safety Score

✓ All Clear
Full profile for Siah →

Popularity Comparison

Casyn Rank #4,583
Siah Rank #4,612

Casyn is more popular, ranked #4583 vs #4612 for Siah.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Casyn ___

  • Casyn James
  • Casyn Lee
  • Casyn Cole
  • Casyn Beau
  • Casyn Wade
  • Casyn Blake

Siah ___

  • Siah James
  • Siah Emmanuel
  • Siah Cole
  • Siah Robert
  • Siah Marcus
  • Siah Lee

Sibling Name Ideas

Names that pair well as siblings.

If you choose Casyn

Mason Jaxon Braylen Brexley Hadley

If you choose Siah

Zion Elijah Nova Aria Micah

Which Name Fits Your Family?

Answer 3 quick questions and we'll help you decide.

1. Which style feels more like your family?

Frequently Asked Questions

Is Casyn or Siah more popular?

Casyn is more popular, ranked #4583 compared to Siah at #4612 in the United States.

What do Casyn and Siah mean?

Casyn means "vigilant, watchful" (Irish Gaelic origin). Siah means "God is salvation" (Hebrew origin).

Are Casyn and Siah boy or girl names?

Casyn is primarily a boy name. Siah is primarily a boy name.

More Comparisons

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← Full profile: Casyn ← Full profile: Siah Browse all baby names