Sei vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Sei Rank #12,801
Theodore Rank #4

Theodore is more popular, ranked #4 vs #12801 for Sei.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Sei ___

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 Sei

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 Sei or Theodore more popular?

Theodore is more popular, ranked #4 compared to Sei at #12801 in the United States.

What do Sei and Theodore mean?

Theodore means "divine gift" (Greek origin).

Are Sei and Theodore boy or girl names?

Sei is primarily a boy name. Theodore is primarily a boy name.

More Comparisons

Theodore vs Sei Sei vs Emit Sei vs Kuan Sei vs Diane Sei vs Mason
← Full profile: Sei ← Full profile: Theodore Browse all baby names