Euclides
Euclides is the Portuguese form of Euclid, the ancient Greek mathematician traditionally regarded as the father of geometry. Euclid's Elements, a comprehensive compilation of definitions, postulates and theorems, organized geometric knowledge into a systematic framework that shaped the study of geometry for centuries. In addition to geometry, Euclid's work touched on number theory and mathematical rigor. The historical details of Euclid's life are sparse; tradition places him in Alexandria around the 4th to 3rd centuries BCE, though exact dates are uncertain. Nevertheless, Euclid's name became associated with the methods of proof and deductive reasoning that define classical mathematics, and the Euclidean algorithm for computing the greatest common divisor is traditionally attributed to Euclid's school.
Euclides is used as a given name in Portuguese-speaking cultures. Notable individuals include Euclides da Cunha
Thus, Euclides functions as both a reference to Euclid and as a personal name in Portuguese-speaking countries.