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English word savior comes from Italian salvare, and later Latin salvo ((Late Latin) I save (make safe or healthy).)
salvare (Italian)
(transitive) to save, guard, safeguard, protect, defend. (transitive) to save, rescue, retrieve, deliver.
salvo (Latin)
(Late Latin) I save (make safe or healthy).
salvator (Late Latin)
sauveour (Old French)
saviour (Middle English)
savior (English)
(US) A person who saves someone, rescues another from harm.. (US, medicine) A child who is born to provide an organ or cell transplant to a sibling who has an otherwise fatal disease (used in combination, with "sibling", "baby", "child", "brother", "sister", etc.).