Isaac vs Knox

Baby Name Comparison — 2026

Isaac

Boy #40 Most Popular 3 Syllables

Meaning

"He will laugh; laughter"

Origin: Hebrew

Cultural Roots

English Jewish Spanish French

Quick Stats

Popularity Rank
#40
Total SSA Count
6,498
Syllables
3
Formality
Moderate
Nicknames
Ike, Izzy, Zac

Playground Safety Score

✓ All Clear
Full profile for Isaac →

Popularity Comparison

Isaac Rank #40
Knox Rank #209

Isaac is more popular, ranked #40 vs #209 for Knox.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Isaac ___

  • Isaac James
  • Isaac Alexander
  • Isaac John
  • Isaac Thomas
  • Isaac Oliver
  • Isaac William

Knox ___

  • Knox James
  • Knox Oliver
  • Knox William
  • Knox Henry
  • Knox Alexander
  • Knox Reid

Sibling Name Ideas

Names that pair well as siblings.

If you choose Isaac

Elijah Noah Jonah Miriam Hannah

If you choose Knox

Ryder Lennox Jagger Saylor Piper

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 Isaac or Knox more popular?

Isaac is more popular, ranked #40 compared to Knox at #209 in the United States.

What do Isaac and Knox mean?

Isaac means "He will laugh; laughter" (Hebrew origin). Knox means "round hill" (Old English/Scottish origin).

Are Isaac and Knox boy or girl names?

Isaac is primarily a boy name. Knox is primarily a boy name.

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← Full profile: Isaac ← Full profile: Knox Browse all baby names