Muppet (n.)youdaoicibaDictYouDict[Muppet 词源字典]
Trademark (U.S.) Sept. 26, 1972, claiming use from 1971, but in print from Sept. 1970. Name coined by creator Jim Henson (1936-1990), who said, despite the resemblance to marionette and puppet (they have qualities of both), it has no etymology; he just liked the sound.[Muppet etymology, Muppet origin, 英语词源]
Mylar (n.)youdaoicibaDictYouDict
proper name for a polyester film, 1954, trademarked by E.I. Du Pont de Nemours and Co., Wilmington, Delaware, U.S.A. Like many Du Pont names, it doesn't mean anything, they just liked the sound.