Cosmo vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Cosmo Rank #1,691
Theodore Rank #4

Theodore is more popular, ranked #4 vs #1691 for Cosmo.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Cosmo ___

  • Cosmo James
  • Cosmo Ray
  • Cosmo Lee
  • Cosmo Blue
  • Cosmo Fox

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 Cosmo

Cosima Orion Luna Stellan Felix

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 Cosmo or Theodore more popular?

Theodore is more popular, ranked #4 compared to Cosmo at #1691 in the United States.

What do Cosmo and Theodore mean?

Cosmo means "order, universe" (Greek origin). Theodore means "divine gift" (Greek origin).

Are Cosmo and Theodore boy or girl names?

Cosmo is primarily a boy name. Theodore is primarily a boy name.

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