Sierra

Originally indicated a dweller on a hill range or ridge, from Spanish sierra “mountain range”, derived from Latin serra “saw”.
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Sienkiewicz

Patronymic from the given name Sienko, an old diminutive of Szymon. This was the surname of the Polish writer Henryk Sienkiewicz (1846-1916).
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Siena

Indicated a person from Siena in Italy, which was named after the Gaulish tribe of the Senones.
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