French, literally "good" (adj.), from Latin bonus "good" (see bonus). It has crossed the Channel in phrases such as bon appétit, literally "good appetite" (1860); bon-ton "good style" (1744); bon mot (1735), etc. Compare boon, bonhomie.
c. 1300, from Old French voiage "travel, journey, movement, course, errand, mission, crusade" (12c., Modern French voyage), from Late Latin viaticum "a journey" (in classical Latin "provisions for a journey"), noun use of neuter of viaticus "of or for a journey," from via "road, journey, travel" (see via).
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<a href="https://www.etymonline.com/word/bon voyage">Etymology of bon voyage by etymonline</a>
Harper, D. (n.d.). Etymology of bon voyage. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/bon voyage