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Sebastián is the Spanish form of the Latin name Sebastianus, derived from the Greek Sebastianos, meaning "from Sebastos," a Greek title equivalent to the Latin Augustus and carrying the sense of "venerable" or "revered." The name gained widespread use in medieval Europe largely through the cult of Saint Sebastian, a third-century Christian martyr whose legendary steadfastness made him a popular devotional figure across Catholic countries. It remains a common given name throughout the Spanish- and Portuguese-speaking world, and its cognates include Sebastiano in Italian, Sébastien in French, Sebastian in English and German, and Sebastião in Portuguese.