Cassian vs Theodore

Baby Name Comparison — 2026

Cassian

Boy #617 Most Popular 3 Syllables

Meaning

"of the Cassian family (Roman gens)"

Origin: Latin

Cultural Roots

English American European

Quick Stats

Popularity Rank
#617
Total SSA Count
462
Syllables
3
Formality
Moderate
Nicknames
Cass, Cas

Playground Safety Score

✓ All Clear
Full profile for Cassian →

Popularity Comparison

Cassian Rank #617
Theodore Rank #4

Theodore is more popular, ranked #4 vs #617 for Cassian.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Cassian ___

  • Cassian James
  • Cassian Alexander
  • Cassian Oliver
  • Cassian Alaric
  • Cassian Frederick
  • Cassian Julian

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 Cassian

Sebastian Dorian Vivienne Isolde Adrian

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 Cassian or Theodore more popular?

Theodore is more popular, ranked #4 compared to Cassian at #617 in the United States.

What do Cassian and Theodore mean?

Cassian means "of the Cassian family (Roman gens)" (Latin origin). Theodore means "divine gift" (Greek origin).

Are Cassian and Theodore boy or girl names?

Cassian is primarily a boy name. Theodore is primarily a boy name.

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