A Biblical name from Hebrew, traditionally understood as "may he expand" or "enlargement."
Japheth is one of the great biblical names, worn by the third son of Noah — listed alongside Shem and Ham in Genesis as the progenitor of one branch of post-Flood humanity. The Hebrew Yefet is most often interpreted as meaning 'may he expand' or 'beauty,' rooted in the verb pata, to be wide or spacious, and the ancient Priestly source in Genesis offers a punning etymology when Noah declares that 'God shall enlarge Japheth.' Later ethnographic traditions in Genesis 10 traced the peoples of the Aegean, Anatolia, and Europe to Japheth's descendants, making his name, for centuries of biblical scholars, a mythological explanation for the origins of what would come to be called the Indo-European world.
Though never as common as the names of his brothers' descendants — Abraham, Isaac, and the dozens of Semitic names that filled Christian and Jewish communities — Japheth was used with some regularity in Puritan England and early colonial America, where deep familiarity with the Old Testament made even its rarer names household words. It carried the weight of covenantal promise and biblical narrative that parents in those communities valued above fashionability. The name also appears in Islamic tradition, rendered as Yafith, as one of Noah's sons in the Quranic commentary tradition.
In the contemporary period Japheth has become genuinely rare, which paradoxically is part of its appeal for parents seeking a name that is unmistakably biblical and meaningful without being ubiquitous. It reads as ancient and serious, connected to one of the most enduring stories in human literature, with a sound — two syllables, soft opening, voiced ending — that wears well in daily life despite its august origins.