English word saviour comes from Latin -ator, Latin salvare, and later Latin salvator (Saviour.)
-ator (Latin)
Enlarged form of -tor, used to form agent nouns; -ator, -er.
salvare (Latin)
salvator (Latin)
Saviour.
sauveor (Old French)
Savior.
salvatour (Middle English)
saviour (English)