Arlo vs Declan

Baby Name Comparison — 2026

Arlo

Boy #146 Most Popular 2 Syllables

Meaning

"fortified hill"

Origin: Old English

Cultural Roots

English American Australian

Quick Stats

Popularity Rank
#146
Total SSA Count
2,481
Syllables
2
Formality
Casual

Playground Safety Score

✓ All Clear
Full profile for Arlo →

Declan

Boy #131 Most Popular 2 Syllables

Meaning

"man of prayer"

Origin: Irish Gaelic

Cultural Roots

Irish English American

Quick Stats

Popularity Rank
#131
Total SSA Count
2,758
Syllables
2
Formality
Moderate
Nicknames
Dec, Decs

Playground Safety Score

✓ All Clear
Full profile for Declan →

Popularity Comparison

Arlo Rank #146
Declan Rank #131

Declan is more popular, ranked #131 vs #146 for Arlo.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Arlo ___

  • Arlo James
  • Arlo Thomas
  • Arlo Bear
  • Arlo Fox
  • Arlo River
  • Arlo Blue

Declan ___

  • Declan James
  • Declan Patrick
  • Declan Michael
  • Declan Ryan
  • Declan Thomas
  • Declan Cole

Sibling Name Ideas

Names that pair well as siblings.

If you choose Arlo

Milo Isla Clover Finn Margot

If you choose Declan

Finn Liam Siobhan Aoife Rowan

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 Arlo or Declan more popular?

Declan is more popular, ranked #131 compared to Arlo at #146 in the United States.

What do Arlo and Declan mean?

Arlo means "fortified hill" (Old English origin). Declan means "man of prayer" (Irish Gaelic origin).

Are Arlo and Declan boy or girl names?

Arlo is primarily a boy name. Declan is primarily a boy name.

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← Full profile: Arlo ← Full profile: Declan Browse all baby names