Day vs Theodore

Baby Name Comparison — 2026

Day

Girl #14,900 Most Popular 1 Syllable

Meaning

"daylight, brightness"

Origin: Old English

Cultural Roots

English American

Quick Stats

Popularity Rank
#14,900
Total SSA Count
8
Syllables
1
Formality
Casual

Playground Safety Score

✓ All Clear
Full profile for Day →

Popularity Comparison

Day Rank #14,900
Theodore Rank #4

Theodore is more popular, ranked #4 vs #14900 for Day.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Day ___

  • Day Marie
  • Day Lynn
  • Day Anne
  • Day Grace
  • Day Hope
  • Day Elise

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 Day

Night Dawn Sun Ember Skye

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 Day or Theodore more popular?

Theodore is more popular, ranked #4 compared to Day at #14900 in the United States.

What do Day and Theodore mean?

Day means "daylight, brightness" (Old English origin). Theodore means "divine gift" (Greek origin).

Are Day and Theodore boy or girl names?

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

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