Isay is a Russian masculine given name, derived as a vernacular form of the biblical Hebrew name Isaiah (from Hebrew Yesha'yahu, meaning “Yahweh is salvation”).Etymology and Religious ContextThe root name Isaiah belongs to one of the four major prophets of the Old Testament, the traditionary author of the Book of Isaiah. Its components are the verb yasha' (“to save”) and the divine name Yah, restoring two core theophoric elements common in Hebrew onomastics. As an English Christian name, Isaiah came into use only after the Protestant Reformation; in Slavic cultures, the name arrived via the Eastern Orthodox tradition, which adopted many Hebrew names through Church Slavonic biblical texts. The Russian form Isay emerges directly from the Slavonic recension of the name.Notable BearersThe best-known historical bearer in Russia is Isay Polyanov, a 16th-century icon painter of the Novgorod school renowned for his frescoes in the Cathedral of the Dormition of the Moscow Kremlin. The name also gained prominence among Old Believers, who often revived ancient given names that marked commitment to pre-reform traditions. In modern Russian society, Isay is a rare but stable choice, occasionally used among educated elites.Cultural and Distribution NotesIsay is employed primarily in Russia and, to a lesser extent, in Belarus, Ukraine, and among the diaspora in Israel and the Baltic states. Its frequency fell sharply during the 20th century but has seen moderate revival due to interest in biblical names and historic russified forms. Surnames derived from Isay’s patronymic—like Isaev and Isayeva—are widespread, reflecting the name’s past generational presence.Cognates across languages include Esaias (Biblical Latin), Izaiah (English innovation), Yesha'yahu (Biblical Hebrew), and Isiah (common English variant).Meaning: “Yahweh is salvation”Origin: Russian form of Hebrew IsaiahType: Religious biblical nameUsage: Russia, Ukraine, Belarus, among Eastern Orthodox