Cass vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Cass Rank #5,414
Theodore Rank #4

Theodore is more popular, ranked #4 vs #5414 for Cass.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Cass ___

  • Cass River
  • Cass James
  • Cass Elliott
  • Cass Monroe
  • Cass Theodore
  • Cass August

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 Cass

Juno Wren Beau Quinn Milo

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 Cass or Theodore more popular?

Theodore is more popular, ranked #4 compared to Cass at #5414 in the United States.

What do Cass and Theodore mean?

Cass means "hollow, vain (from Latin Cassius)" (Latin origin). Theodore means "divine gift" (Greek origin).

Are Cass and Theodore boy or girl names?

Cass is primarily a boy name. Theodore is primarily a boy name.

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