Si vs Willliam

Baby Name Comparison — 2026

Si

Girl #14,410 Most Popular

15 High Risk

{:type=>:rhyme, :severity=>:medium, :message=>"'Si' rhymes with 'pee'"}

Boy #20,467 Most Popular

✓ All Clear

Si Rank #14,410

Willliam Rank #20,467

Si is more popular, ranked #14410 vs #20467 for Willliam.

Historical US popularity rank — lower number means more popular.

Answer 3 quick questions and we'll help you decide.

1. Which style feels more like your family?

Is Si or Willliam more popular?

Si is more popular, ranked #14410 compared to Willliam at #20467 in the United States.

Are Si and Willliam boy or girl names?

Si is primarily a girl name. Willliam is primarily a boy name.