Isaac

American  

[ahy-zuhk] / ˈaɪ zək /

noun

1. (in the Bible) a son of Abraham and Sarah, and the father of Jacob.

2. a male given name: from a Hebrew word meaning “laughter.”

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Isaac British  

/ ˈaɪzək /

noun

1. an Old Testament patriarch, the son of Abraham and Sarah and father of Jacob and Esau (Genesis 17; 21–27)

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Isaac Cultural  

1. The son of Abraham and the father of Jacob and Esau.

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Discover More

Abraham was prepared to sacrifice Isaac at God's request. (See Abraham and Isaac.)

Compare meaning

How does isaac compare to similar and commonly confused words? Explore the most common comparisons:

• Ishmael vs. Isaac

Example Sentences

In the end, he beat both Isaac Singer and Walter Hunt, among others.

From The Wall Street Journal • Apr. 12, 2026

A few years later, in 2007, she had a baby boy who she named Isaac.

From BBC • Apr. 11, 2026

Price cuts for VantageScore reports by credit bureaus led to Fair Isaac stock falling 26% since March 6.

From Barron's • Apr. 7, 2026

Cleveland 6, South Gate 1: Isaac Stone struck out seven in six innings for the 7-8 Cavaliers.

From Los Angeles Times • Mar. 30, 2026

“And I am ready to work,” Isaac says.

From "Across So Many Seas" by Ruth Behar