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Sá is a surname of Portuguese origin. It appears as a standalone surname and as part of compound surnames such as de Sá. In Portugal and Brazil, Sá is a common family name and can be found across many regions and social groups. The accent on the a in Sá reflects Portuguese orthography and affects pronunciation, typically yielding a stressed syllable.

The etymology of Sá is not definitively established. It may derive from a pre-Roman personal name, a geographic location, or a descriptive nickname that later became hereditary. Through migration and diaspora, the surname has spread to other Portuguese-speaking communities and to populations influenced by Iberian naming patterns.

Notable people with the surname Sá have achieved recognition in fields such as sports, literature, science, and the arts. As with many surnames, Sá is carried by individuals with diverse backgrounds, making it a representative example of Lusophone surname distribution.

Related surnames and forms include de Sá, Sá e Sousa, and other variants where Sá forms part of a longer genealogical compound. In some contexts, Sá can appear as part of a given-name compound in different cultures, though it remains most widely known as a Portuguese surname.