Keg

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early 17th century: variant of Scots and US dialect cag, from Old Norse kaggi .

wiktionary

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From Middle English kag, from Old Norse kaggi(“keg”). Cognate with Icelandic kaggi(“keg; cask”), Norwegian kagg(“keg”), Swedish kagge(“keg”), Low German kag(“vessel; craft”), Dutch kaag(“vessel; craft”).

etymonline

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keg (n.)

1630s, earlier kag (mid-15c.), from a Scandinavian source such as Old Norse kaggi "keg, cask," of unknown origin. Cognate with Swedish kagge, Norwegian kagg. Specific sense of "small or half barrel of beer" is from 1945. U.S. student slang kegger "party featuring a keg of beer" attested by 1969.