Castor vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Castor Rank #7,391
Theodore Rank #4

Theodore is more popular, ranked #4 vs #7391 for Castor.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Castor ___

No pairings available yet.

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 Castor

No sibling data available yet.

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 Castor or Theodore more popular?

Theodore is more popular, ranked #4 compared to Castor at #7391 in the United States.

What do Castor and Theodore mean?

Theodore means "divine gift" (Greek origin).

Are Castor and Theodore boy or girl names?

Castor is primarily a boy name. Theodore is primarily a boy name.

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