Castle vs Theodore

Baby Name Comparison — 2026

Castle

Boy #4,304 Most Popular 2 Syllables

Meaning

"fortified stronghold"

Origin: Latin/Norman French

Cultural Roots

American English

Quick Stats

Popularity Rank
#4,304
Total SSA Count
25
Syllables
2
Formality
Moderate
Nicknames
Cas, Cass

Playground Safety Score

✓ All Clear
Full profile for Castle →

Popularity Comparison

Castle Rank #4,304
Theodore Rank #4

Theodore is more popular, ranked #4 vs #4304 for Castle.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Castle ___

  • Castle James
  • Castle Lee
  • Castle River
  • Castle Grey
  • Castle Reid
  • Castle Stone

Theodore ___

  • Theodore James
  • Theodore William
  • Theodore Alexander
  • Theodore John
  • Theodore Henry
  • Theodore Arthur

Sibling Name Ideas

Names that pair well as siblings.

If you choose Castle

Bridger Archer London Beacon Harbor

If you choose Theodore

Olivia Charlotte Amelia Eleanor Oliver

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 Castle or Theodore more popular?

Theodore is more popular, ranked #4 compared to Castle at #4304 in the United States.

What do Castle and Theodore mean?

Castle means "fortified stronghold" (Latin/Norman French origin). Theodore means "divine gift" (Greek origin).

Are Castle and Theodore boy or girl names?

Castle is primarily a boy name. Theodore is primarily a boy name.

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← Full profile: Castle ← Full profile: Theodore Browse all baby names