Kaelyn vs Theodore

Baby Name Comparison — 2026

Kaelyn

Girl #1,637 Most Popular 3 Syllables

Meaning

"keeper of the keys; pure"

Origin: Celtic/Irish via Caitlin

Cultural Roots

American Irish-American

Quick Stats

Popularity Rank
#1,637
Total SSA Count
126
Syllables
3
Formality
Casual
Nicknames
Kay, Kae

Playground Safety Score

✓ All Clear
Full profile for Kaelyn →

Popularity Comparison

Kaelyn Rank #1,637
Theodore Rank #4

Theodore is more popular, ranked #4 vs #1637 for Kaelyn.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Kaelyn ___

  • Kaelyn Marie
  • Kaelyn Grace
  • Kaelyn Elizabeth
  • Kaelyn Rose
  • Kaelyn Ann
  • Kaelyn Jade

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 Kaelyn

Jayden Brayden Madison Avery Riley

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 Kaelyn or Theodore more popular?

Theodore is more popular, ranked #4 compared to Kaelyn at #1637 in the United States.

What do Kaelyn and Theodore mean?

Kaelyn means "keeper of the keys; pure" (Celtic/Irish via Caitlin origin). Theodore means "divine gift" (Greek origin).

Are Kaelyn and Theodore boy or girl names?

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

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