Alessio vs Guillermo

Baby Name Comparison — 2026

Alessio

Boy #948 Most Popular 3 Syllables

Meaning

"defender, helper of mankind"

Origin: Greek (alexein)

Cultural Roots

Italian Spanish Greek Southern European

Quick Stats

Popularity Rank
#948
Total SSA Count
241
Syllables
3
Formality
Moderate
Nicknames
Alex, Leo, Ale

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

Alessio Rank #948
Guillermo Rank #833

Guillermo is more popular, ranked #833 vs #948 for Alessio.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Alessio ___

  • Alessio Marco
  • Alessio Luca
  • Alessio Romano
  • Alessio Giovanni
  • Alessio Matteo
  • Alessio Enzo

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 Alessio

Giulia Matteo Sofia Leonardo Isabella

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 Alessio or Guillermo more popular?

Guillermo is more popular, ranked #833 compared to Alessio at #948 in the United States.

What do Alessio and Guillermo mean?

Alessio means "defender, helper of mankind" (Greek (alexein) origin). Guillermo means "resolute protector" (Old High German wil (will) + helm (protection) origin).

Are Alessio and Guillermo boy or girl names?

Alessio is primarily a boy name. Guillermo is primarily a boy name.

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