Yefim (also spelled Efim) is a Russian vernacular form of the ancient Greek name Euthymius, which itself derives from the Greek Euthymios (Εὐθύμιος) meaning "in good spirits, generous" — from the elements eu "good" and thymos "soul, spirit". The name was borne by several early Christian saints, contributing to its adoption in Orthodox Christian cultures. Etymology and Historical Context Euthymius was a popular name in the Byzantine Empire, honored by saints such as Euthymius the Great (377–473), a monastic founder in Palestine. In Russian, the name was adapted as Yefim (Ефим) or the longer form Yevfimiy, reflecting the Slavic sound system. A common diminutive is Fima (Фима). Notable Bearers Notable individuals named Yefim or Efim include figures from the arts, sciences, and sports: Efim Bogoljubov (1889–1962), German chess grandmaster of Russian origin Efim Geller (1925–1998), Soviet chess grandmaster Efim Zelmanov (born 1955), Russian-American mathematician and Fields Medalist Efim Etkind (1918–1999), Russian philologist and literary scholar Efim Dzigan (1898–1981), Soviet film director Yefim Cherepanov (1774–1842), Russian inventor and co-builder of the first Russian steam locomotive The Wikipedia extract for the name covers a range of other bearers, including comedians, physicists, and deputies, demonstrating the name's spread across diverse fields. Usage and Related Forms Besides Fima, diminutive variants in Russian include Efimka or Fima. Under Related Names, the brief lists the vernacular variant Yevfimiy, as well as forms in other languages: Greek Efthimios (and Euthymios), Spanish Eutimio/Eutímio. In modern Greek, the name remains common today. Cultural and Linguistic Notes The shift from Greek Euthymios to Russian Yefim involved dropping the Latinized /th/ sound and adding a patronymic-based declension system. The name is distinctly Russian, though versions like Efim are also used by other Slavic peoples. Meaning: "in good spirits, generous" (from Greek elements meaning "good" + "soul/spirit") Origin: Ancient Greek, via the Christian saint Euthymius Usage: Predominantly Russian; also in Belarusian, Ukrainian Type: First name (male) Related: Yevfimiy (Russian variant), Fima (diminutive), Efthymios (Modern Greek)