Guillermo vs Theodore

Baby Name Comparison — 2026

Guillermo

Boy #833 Most Popular 3 Syllables

Meaning

"resolute protector"

Origin: Old High German wil (will) + helm (protection)

Cultural Roots

Spanish Latin American Filipino Portuguese

Quick Stats

Popularity Rank
#833
Total SSA Count
297
Syllables
3
Formality
Formal
Nicknames
Memo, Guille, Willy

Playground Safety Score

✓ All Clear
Full profile for Guillermo →

Popularity Comparison

Guillermo Rank #833
Theodore Rank #4

Theodore is more popular, ranked #4 vs #833 for Guillermo.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Guillermo ___

  • Guillermo Alejandro
  • Guillermo Antonio
  • Guillermo Eduardo
  • Guillermo Rafael
  • Guillermo Miguel
  • Guillermo Carlos

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 Guillermo

Fernando Ricardo Alejandra Lucia Isabella

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 Guillermo or Theodore more popular?

Theodore is more popular, ranked #4 compared to Guillermo at #833 in the United States.

What do Guillermo and Theodore mean?

Guillermo means "resolute protector" (Old High German wil (will) + helm (protection) origin). Theodore means "divine gift" (Greek origin).

Are Guillermo and Theodore boy or girl names?

Guillermo is primarily a boy name. Theodore is primarily a boy name.

More Comparisons

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