Hangar (n.) -- etymology

Sense of "covered shed for airplanes" first recorded in English 1902, from French use in that sense.

• 1852, "shed for carriages," from French hangar "shed," which is of uncertain origin. 
• probably from Middle French hanghart (14th century)
• perhaps an alteration of Middle Dutch *ham-gaerd "enclosure near a house" [Barnhart, Watkins]
• from a Proto-Germanic compound *haimgardaz of the elements that make home (n.) and yard (n.1). 

Or the Middle French word might be from Medieval Latin angarium "shed in which horses are shod" [Gamillscheg, Klein].

SEE: Online Etymology Dictionary