Aktually, Led Zeppelin was named when Jimmy Page told Keith Moon he was putting together a band, Keith said "That’ll go over like a Lead Zeppelin"
A compleat Zeppelin Gear List can be found at http://www.Ledzeppelin.org
The Beatles- A pun, the Bug part came from the Crickets, and british rock groups at the time were called "Beat groups" hence the misspelling.
The Byrds- They misspelled their name as a play off of the beatles.
Emerson Lake and Palmer. . . hmmm. <img>