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The term was first used by Chrysler in the 1920s and was introduced as a brand starting in 1937. The name "Mopar" was created by a committee to use on cans of "Chrysler Motor Parts" antifreeze.^[1]

Mopar parts are original equipment manufactured parts for FCA US LLC vehicles. The term "Mopar" has passed into broader usage among car enthusiasts as an unambiguous reference to vehicles produced by former parent company Chrysler Corporation/Chrysler Group LLC, now FCA US.^[4][5]

The term has thus become an inclusive word for any Chrysler-built vehicle—most any Dodge, Chrysler, Plymouth, Imperial, DeSoto or Dodge Trucks/Ram. By extension, it is also used for Jeep and AMC vehicles built after Chrysler's 1987 buyout of American Motors Corporation including the short-lived Eagle brand.^[6][7]

In Canada, Chrysler parts were sold under the "Chryco" and "AutoPar" brands until the Mopar brand was introduced into that nation's market, starting in the late 1970s.

thanks to wikipedia for the blurb