Castro vs Sulo

Baby Name Comparison — 2026

Castro

Boy #17,549 Most Popular 2 Syllables

Meaning

"castle, fortress"

Origin: Latin

Cultural Roots

Spanish Portuguese Latin American

Quick Stats

Popularity Rank
#17,549
Total SSA Count
6
Syllables
2
Formality
Moderate
Nicknames
Cas, Caz

Playground Safety Score

✓ All Clear
Full profile for Castro →

Popularity Comparison

Castro Rank #17,549
Sulo Rank #17,375

Sulo is more popular, ranked #17375 vs #17549 for Castro.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Castro ___

  • Castro Luis
  • Castro Miguel
  • Castro Antonio
  • Castro Rafael
  • Castro Emilio

Sulo ___

No pairings available yet.

Sibling Name Ideas

Names that pair well as siblings.

If you choose Castro

Diego Mateo Isabella Valentina

If you choose Sulo

No sibling data available yet.

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 Castro or Sulo more popular?

Sulo is more popular, ranked #17375 compared to Castro at #17549 in the United States.

What do Castro and Sulo mean?

Castro means "castle, fortress" (Latin origin).

Are Castro and Sulo boy or girl names?

Castro is primarily a boy name. Sulo is primarily a boy name.

More Comparisons

Sulo vs Castro Castro vs Hurman Castro vs Kunal Castro vs Celina Castro vs Castro
← Full profile: Castro ← Full profile: Sulo Browse all baby names