Mariner
Middle English: from Old French marinier, from medieval Latin marinarius, from Latin marinus (see marine).
wiktionary
From Middle English mariner, marinere, borrowed from Anglo-Norman mariner, marinier, from Old French marinier, maronnier, from marin; perhaps corresponding to a post-Classical or Vulgar Latin marinarius(“sailor”), from marīnus(“marine; relating to the sea”). Eclipsed non-native Middle English marinel, marynell(“mariner, sailor”) borrowed from Old French marinel.
etymonline
mariner (n.)
"seaman, sailor, one who directs or assists in navigating a ship," mid-13c., from Anglo-French mariner, Old French marinier "seaman, sailor" (12c.), from Medieval Latin marinarius "sailor," "of the sea, maritime," from Latin marinus "of the sea," from mare "sea, the sea, seawater," from PIE root *mori- "body of water." Earlier and long more common than sailor. A sailor also could be a brimgeist in Old English.
