Aileen vs Theodore

Baby Name Comparison — 2026

Aileen

Girl #718 Most Popular 2 Syllables

Meaning

"bright, shining light"

Origin: Irish/Greek Helene

Cultural Roots

Irish Scottish English American

Quick Stats

Popularity Rank
#718
Total SSA Count
390
Syllables
2
Formality
Moderate
Nicknames
Ally, Lee, Leenie

Playground Safety Score

15 High Risk

{:type=>:rhyme, :severity=>:medium, :message=>"'Aileen' rhymes with 'mean'"}

Full profile for Aileen →

Popularity Comparison

Aileen Rank #718
Theodore Rank #4

Theodore is more popular, ranked #4 vs #718 for Aileen.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Aileen ___

  • Aileen Rose
  • Aileen Marie
  • Aileen Grace
  • Aileen Patricia
  • Aileen Margaret
  • Aileen Frances

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 Aileen

Brigid Colleen Fiona Patrick Seamus

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 Aileen or Theodore more popular?

Theodore is more popular, ranked #4 compared to Aileen at #718 in the United States.

What do Aileen and Theodore mean?

Aileen means "bright, shining light" (Irish/Greek Helene origin). Theodore means "divine gift" (Greek origin).

Are Aileen and Theodore boy or girl names?

Aileen is primarily a girl name. Theodore is primarily a boy name.

More Comparisons

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← Full profile: Aileen ← Full profile: Theodore Browse all baby names