Isaac

Sarah, ninety years old and long past hope, laughs out loud when she is told she will bear a son — and so the boy is named Yitzhak, Hebrew for he will laugh. It is one of the tenderest etymologies in any scripture: a whole life built on a mother's startled joy, and a name that arrives already laughing. The biblical Isaac is the second of the three patriarchs (Abraham, Isaac, and Jacob) of the Hebrew Bible, the long-awaited only son of Abraham and Sarah, the boy whose near-sacrifice on Mount Moriah became one of the foundational stories of three faiths — Jewish, Christian, and Islamic, where he is called Ishaq.

The name has been worn by Sir Isaac Newton (whose Principia Mathematica reorganized physics in 1687, and who developed calculus more or less concurrently with Leibniz); the Yiddish-language Nobel laureate Isaac Bashevis Singer; the science fiction grandmaster Isaac Asimov (born Isaak Yudovich Ozimov in Russia, 1920); the violin virtuoso Isaac Stern; and the actor Isaac Hayes.

Isaac has been a steady but unflashy American name for two centuries, climbing into the SSA top 100 in 1999 and the top 30 by 2018, currently at rank forty. The modern revival is part of a broader Hebrew-vintage wave (Asher, Ezra, Levi, Eli, Isaac). Two syllables — EYE-zik — with a bright opening and a soft closing consonant. Pairs cleanly with both Hebrew-leaning and modern siblings (Isaac and Asher, Isaac and Mae, Isaac and Wren). Nicknames are limited: Ike for the historical (Eisenhower used it), Zac for the modern, Ishi in some traditions. Biblical, warm, unexpectedly cheerful.