Cassidy vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Cassidy Rank #476
Theodore Rank #4

Theodore is more popular, ranked #4 vs #476 for Cassidy.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Cassidy ___

  • Cassidy Rose
  • Cassidy Ann
  • Cassidy Jane
  • Cassidy Renee
  • Cassidy Elizabeth
  • Cassidy Marie

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 Cassidy

Montana Savannah Ryder Colton Dakota

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 Cassidy or Theodore more popular?

Theodore is more popular, ranked #4 compared to Cassidy at #476 in the United States.

What do Cassidy and Theodore mean?

Cassidy means "curly-haired" (Irish origin). Theodore means "divine gift" (Greek origin).

Are Cassidy and Theodore boy or girl names?

Cassidy is primarily a girl name. Theodore is primarily a boy name.

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