Jillian vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Jillian Rank #1,133
Theodore Rank #4

Theodore is more popular, ranked #4 vs #1133 for Jillian.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Jillian ___

  • Jillian Marie
  • Jillian Ann
  • Jillian Rose
  • Jillian Grace
  • Jillian Elizabeth
  • Jillian Claire

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 Jillian

Jennifer Michelle Melissa Kevin Brian

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 Jillian or Theodore more popular?

Theodore is more popular, ranked #4 compared to Jillian at #1133 in the United States.

What do Jillian and Theodore mean?

Jillian means "youthful" (Latin origin). Theodore means "divine gift" (Greek origin).

Are Jillian and Theodore boy or girl names?

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

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