Gillian vs Theodore

Baby Name Comparison — 2026

Popularity Comparison

Gillian Rank #3,126
Theodore Rank #4

Theodore is more popular, ranked #4 vs #3126 for Gillian.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Gillian ___

  • Gillian Rose
  • Gillian Anne
  • Gillian Claire
  • Gillian Marie
  • Gillian Hope
  • Gillian Grace

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 Gillian

Alison Sheila Colin Duncan Fiona

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 Gillian or Theodore more popular?

Theodore is more popular, ranked #4 compared to Gillian at #3126 in the United States.

What do Gillian and Theodore mean?

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

Are Gillian and Theodore boy or girl names?

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

More Comparisons

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