Efthymios is a modern Greek masculine given name, the vernacular form of the ancient name Euthymios (Latinized as Euthymius). It derives from the Greek adjective εὔθυμος (euthymos), which combines the elements εὖ (eu) 'good' and θυμός (thymos) 'soul, spirit', thus meaning 'in good spirits, generous'.Historical and Religious ContextThe name Euthymios was borne by several early Christian saints, most notably Saint Euthymius the Great (c. 377–473), an anchorite from Armenia who helped establish monasticism in Palestine. Another prominent bearer was Saint Euthymius of Sardis (4th–5th century), a bishop. These figures contributed to the name's popularity in Byzantine Christianity, and through veneration the name spread among Greek-speaking Orthodox populations. The modern form Efthymios has remained common in Greece, especially in ecclesiastical contexts.Linguistic VariantsRelated Greek forms include the variant Efthimios (with /i/ instead of /y/) and the feminine counterparts Efthimia and Efthymia. In other languages, the name has been adapted as Eutimio in Spanish, Eutímio in Portuguese, and Yefim (or its diminutive Fima) in Russian, reflecting the Byzantine Church's legacy among Eastern Slavs.Usage TodayIn modern Greece, Efthymios is a traditional name, often shortened to Thymi or Effi. It is most common among older generations and within Orthodox families, though it is still given today. According to data, usage is primarily concentrated in Greece and the Greek diaspora. The nameday is celebrated on January 20 (for Saint Euthymius the Great) in the Greek Orthodox calendar.Meaning: in good spirits, generousOrigin: GreekType: modern vernacular form of EuthymiusUsage Regions: Greece, Cyprus, Greek diaspora