From Hebrew, meaning upright or righteous; also known from the biblical Book of Jasher.
Jasher is a Hebrew name meaning "upright," "righteous," or "just," derived from the root yashar, which connotes straightness of path and moral integrity. The name is perhaps best known from two cryptic references in the Hebrew Bible: the Book of Joshua mentions a now-lost text called the "Book of Jasher" as a source for the miracle of the sun standing still, and the same mysterious book is cited again in Second Samuel. This phantom scripture has fascinated theologians, scholars, and mystics for centuries, giving Jasher an air of ancient, almost apocryphal mystique.
Several texts have claimed to be the authentic Book of Jasher over the centuries — a medieval Hebrew chronicle published in Naples in 1625, and another version produced in the nineteenth century — though none are accepted as the original. This literary ghost story has given the name a peculiar resonance among those drawn to biblical antiquity and hidden history. Jasher appears periodically in Puritan naming traditions, when Old Testament names of even marginal biblical provenance were fashionable, particularly in seventeenth-century England and colonial America.
Today, Jasher occupies a compelling niche among parents who want a name that is unmistakably biblical yet genuinely uncommon. Unlike Asher or Jasper — names with which it shares phonetic territory — Jasher remains rare enough to feel distinctive. Its meaning, "the upright one," is an aspirational virtue that resonates across religious and secular contexts. The name sits at the crossroads of the ancient and the fresh, carrying centuries of scriptural weight while remaining largely unencumbered by modern cultural associations.