Killiam vs Theodore

Baby Name Comparison — 2026

Killiam

Boy #5,792 Most Popular 3 Syllables

Meaning

"little churchman, associated with the church"

Origin: Old Irish ceall + diminutive

Cultural Roots

Irish American

Quick Stats

Popularity Rank
#5,792
Total SSA Count
16
Syllables
3
Formality
Moderate
Nicknames
Kill, Liam, Killy

Playground Safety Score

✓ All Clear
Full profile for Killiam →

Popularity Comparison

Killiam Rank #5,792
Theodore Rank #4

Theodore is more popular, ranked #4 vs #5792 for Killiam.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Killiam ___

  • Killiam James
  • Killiam Patrick
  • Killiam Michael
  • Killiam Sean
  • Killiam Finn
  • Killiam Cole

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 Killiam

Declan Finn Ronan Saoirse Niamh

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 Killiam or Theodore more popular?

Theodore is more popular, ranked #4 compared to Killiam at #5792 in the United States.

What do Killiam and Theodore mean?

Killiam means "little churchman, associated with the church" (Old Irish ceall + diminutive origin). Theodore means "divine gift" (Greek origin).

Are Killiam and Theodore boy or girl names?

Killiam is primarily a boy name. Theodore is primarily a boy name.

More Comparisons

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