Isaac vs Theodore

Baby Name Comparison — 2026

Isaac

Boy #40 Most Popular 3 Syllables

Meaning

"He will laugh; laughter"

Origin: Hebrew

Cultural Roots

English Jewish Spanish French

Quick Stats

Popularity Rank
#40
Total SSA Count
6,498
Syllables
3
Formality
Moderate
Nicknames
Ike, Izzy, Zac

Playground Safety Score

✓ All Clear
Full profile for Isaac →

Popularity Comparison

Isaac Rank #40
Theodore Rank #4

Theodore is more popular, ranked #4 vs #40 for Isaac.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Isaac ___

  • Isaac James
  • Isaac Alexander
  • Isaac John
  • Isaac Thomas
  • Isaac Oliver
  • Isaac William

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 Isaac

Elijah Noah Jonah Miriam Hannah

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 Isaac or Theodore more popular?

Theodore is more popular, ranked #4 compared to Isaac at #40 in the United States.

What do Isaac and Theodore mean?

Isaac means "He will laugh; laughter" (Hebrew origin). Theodore means "divine gift" (Greek origin).

Are Isaac and Theodore boy or girl names?

Isaac is primarily a boy name. Theodore is primarily a boy name.

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