Illiam vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Illiam Rank #23,620
Theodore Rank #4

Theodore is more popular, ranked #4 vs #23620 for Illiam.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Illiam ___

No pairings available yet.

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 Illiam

No sibling data available yet.

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 Illiam or Theodore more popular?

Theodore is more popular, ranked #4 compared to Illiam at #23620 in the United States.

What do Illiam and Theodore mean?

Theodore means "divine gift" (Greek origin).

Are Illiam and Theodore boy or girl names?

Illiam is primarily a boy name. Theodore is primarily a boy name.

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