William vs Theo

Baby Name Comparison — 2026

William

Boy #10 Most Popular 3 Syllables

"resolute protector, strong-willed guardian"

Origin: Germanic

English German French

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Boy #80 Most Popular 2 Syllables

"gift of God"

Origin: Greek (theodoros)

English Greek French German American

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William Rank #10

Theo Rank #80

William is more popular, ranked #10 vs #80 for Theo.

Is William or Theo more popular?

William is more popular, ranked #10 compared to Theo at #80 in the United States.

What do William and Theo mean?

William means "resolute protector, strong-willed guardian" (Germanic origin). Theo means "gift of God" (Greek (theodoros) origin).

Are William and Theo boy or girl names?

William is primarily a boy name. Theo is primarily a boy name.