Alonso vs Guillermo

Baby Name Comparison — 2026

Alonso

Boy #772 Most Popular 3 Syllables

Meaning

"noble and eager, ready for battle"

Origin: Germanic via Visigothic

Cultural Roots

Spanish Latin American Italian

Quick Stats

Popularity Rank
#772
Total SSA Count
327
Syllables
3
Formality
Moderate
Nicknames
Al, Loncho, Lonso

Playground Safety Score

✓ All Clear
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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

Alonso Rank #772
Guillermo Rank #833

Alonso is more popular, ranked #772 vs #833 for Guillermo.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Alonso ___

  • Alonso Fernando
  • Alonso Miguel
  • Alonso Rafael
  • Alonso Carlos
  • Alonso Luis
  • Alonso Rodrigo

Guillermo ___

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

Sibling Name Ideas

Names that pair well as siblings.

If you choose Alonso

Rodrigo Rafael Catalina Valentina Sebastián

If you choose Guillermo

Fernando Ricardo Alejandra Lucia Isabella

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 Alonso or Guillermo more popular?

Alonso is more popular, ranked #772 compared to Guillermo at #833 in the United States.

What do Alonso and Guillermo mean?

Alonso means "noble and eager, ready for battle" (Germanic via Visigothic origin). Guillermo means "resolute protector" (Old High German wil (will) + helm (protection) origin).

Are Alonso and Guillermo boy or girl names?

Alonso is primarily a boy name. Guillermo is primarily a boy name.

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