Sailor

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mid 17th century: variant of obsolete sailer .

wiktionary

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Alteration of earlier sailer, from Middle English sailer, sayler, saylere, equivalent to sail +‎ -or. Cognate with German Segler(“sailor”). Eclipsed non-native Middle English marinel, marynell(“sailor”) borrowed from Old French marinel(“sailor”). See mariner.

etymonline

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sailor (n.)

c. 1400, sailer, agent noun from sail (v.). Spelling with -o- arose 16c., probably by influence of tailor, etc., and to distinguish the meaning "seaman, mariner" from "thing that sails." It replaced much older seaman and mariner (q.q.v.). Old English also had merefara "sailor." Applied as an adjective from 1870s to clothing styles and items based on a sailor's characteristic attire.