Simonis is both a surname and a given name. Notable people with the name include:
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Adrianus Johannes Simonis (1931–2020), Dutch Roman Catholic cardinal and former archbishop of Utrecht
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Eugène Simonis or Eugen Simonis (1810–1893), Belgian sculptor and architect
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Heide Simonis (1943–2023), German politician
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Kazys Šimonis (1887–1978), Lithuanian artist
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Simonis Palaiologina (1294– after 1336), Byzantine princess and third wife of Stefan Uroš II Milutin of Serbia
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Simonis Starovolsci (1588–1656), Polish scholar
See also
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Simono, a Native American group that lived in Nuevo León and later in eastern Texas.
