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English word sailor comes from English sail, and later English sailer (That which sails; a boat.)
sail (English)
(dated) A sailing vessel; a vessel of any kind; a craft. Plural sail.. (fishing) A sailfish.. (nautical) A piece of fabric attached to a boat and arranged such that it causes the wind to drive the boat along. The sail may be attached to the boat via a combination of mast, spars and ropes.. (paleontology) an outward projection of the spine, occurring in certain dinosaurs and synapsids. [...]
sailer (English)
That which sails; a boat.
sailor (English)
A member of the crew of a vessel; a mariner; a common seaman.. A person in the business of navigating ships or other vessels. A person who sails sailing boats as a sport or recreation; see also yachtsman.. Someone knowledgeable in the practical management of ships.