How did Led Zeppelin get their name?

The band was originally formed in 1968 by guitarist Jimmy Page under the name The New Yardbirds in order to fulfill some performance commitments booked before the break up of the original Yardbirds. Robert Plant was the singer. After some concerts, the band's name was changed to Led Zeppelin, after Keith Moon, drummer with The Who, suggested "you'll go over like a lead Zeppelin". The word "lead" is misspelled deliberately to avoid confusion, fearing it might be conceived of as the "lead Zeppelin" (as in "lead singer"), as opposed to a Zeppelin constructed of the metal lead.

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The name of Led Zeppelin was chosen after a newspaper article said the "The New Yardbirds" would "go down like a lead zeppelin". It is merely a legend that Keith Moon and John Entwistle, members of The Who, had said that. Either way, "lead zeppelin", from the phrasing of the article, was changed to Led Zeppelin because the members were afraid that Americans would pronounce "lead" as "leed".
https://en.wikipedia.org/wiki/Led_zeppelin