Isaac
Meaning
"he will laugh," from Yitzchak, named for Sarah's astonished laughter at the promise of a son; a patriarch's name constant in Jewish use and beloved by Puritans, with a warm modern revival to show for it. Ike and Zac come along
Goes by Ike, Isi
The story
Isaac carries one of the warmest origin stories in scripture: when Sarah was told, long past hope, that she would bear a son, she laughed, and the child's name kept the memory of it. From the Hebrew Yitzhak, it means he will laugh. The name has never really left use since: Puritans favored it, Jewish families carried it across centuries, and it belongs to Isaac Newton, who rewrote our understanding of the physical world, and Isaac Asimov, who imagined worlds beyond it. In American records it has been a steady, modest presence across the generations, the kind of name everyone recognized but fewer chose. In the closing decades of the twentieth century it began a long climb, and its strongest run has come in the most recent decades. Few names promise a smile in their very meaning; this one has been doing it for three thousand years.
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Isaac peaked in the 2010s and the 2020s in nearly equal measure.
Popularity in Brazil
85,862 people · the #361 first name in Brazil · about 1 in 2,364 · median age 8
Among people named Isaac living in Brazil at the 2022 census, more were born in the 2010s than in any other decade.
The census also counted 24,343 born between 2020 and August 2022, too recent a span to chart.
Source: IBGE, Censo Demográfico 2022
When you meet Isaac
Most people given the name Isaac in the United States are teenagers or young adults today.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Isaac deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Isaac truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Isaac fits with your family’s names and surname.
Where Isaac travels
Jewish American · a beloved patriarch name steady across generations
Korean American · he will laugh (the patriarch; a warm church classic among Korean American families)
Keep exploring
Names like Isaac · Nicknames for Isaac · Middle names for Isaac · Jewish American baby names · Korean American baby names · Hebrew baby names
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