Niall vs Theodore

Baby Name Comparison — 2026

Niall

Boy #1,586 Most Popular 1 Syllable

Meaning

"champion"

Origin: Old Irish

Cultural Roots

Irish Scottish English

Quick Stats

Popularity Rank
#1,586
Total SSA Count
109
Syllables
1
Formality
Moderate
Nicknames
Nia, Niy, Niie

Playground Safety Score

✓ All Clear
Full profile for Niall →

Popularity Comparison

Niall Rank #1,586
Theodore Rank #4

Theodore is more popular, ranked #4 vs #1586 for Niall.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Niall ___

  • Niall James
  • Niall Patrick
  • Niall Brendan
  • Niall Cormac
  • Niall Finn
  • Niall Declan

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 Niall

Cormac Fionn Brigid Aoife Ciaran

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 Niall or Theodore more popular?

Theodore is more popular, ranked #4 compared to Niall at #1586 in the United States.

What do Niall and Theodore mean?

Niall means "champion" (Old Irish origin). Theodore means "divine gift" (Greek origin).

Are Niall and Theodore boy or girl names?

Niall is primarily a boy name. Theodore is primarily a boy name.

More Comparisons

Theodore vs Niall Niall vs Ahaan Niall vs Issa Niall vs Marlo Niall vs Braxton
← Full profile: Niall ← Full profile: Theodore Browse all baby names