Euclides is a Latinized form of Euclid, derived from the Ancient Greek name Εὐκλείδης (Eukleides), meaning "good glory"—from eu ("good") and kleos ("glory"), combined with the patronymic suffix -ides. Etymology and Historical Context The name's most famous bearer was the 3rd-century BC Greek mathematician Euclid of Alexandria, known as the "father of geometry." His work Elements is one of the most influential mathematical texts in history, remaining a standard textbook until the 19th century. The given name Eukleides was also borne by other notable ancient Greeks, including Eucleides, an archon of Athens in 403 BC known for adopting the Ionic alphabet, and another Greek philosopher from Megara. Usage in Portuguese and Other Languages In Portuguese, Euclides is a masculine given name, most notably borne by Brazilian writer Euclides da Cunha (1866–1909), author of Os Sertões (Rebellion in the Backlands). The name also appears in other Romance languages, though with different spellings: Spanish uses Euclides or Euclidean, Italian uses Euclide, and French uses Euclide. Cultural Significance As a given name, Euclides carries strong scholarly and intellectual connotations due to its association with geometry. It remains somewhat rare in modern usage but persists in academic and traditional circles, particularly in Portuguese- and Spanish-speaking countries. The name also appears in astronomy, with the Euclid space telescope named after the mathematician, launched by the European Space Agency in 2023 to study dark energy. Meaning: "good glory" from Greek elements eu and kleos Origin: Ancient Greek, Latinized Type: Given name (masculine) Usage regions: Portugal, Brazil, Ancient Greek world; derivatives in Spanish, Italian, French