How did a bands' name originate?

In an attempt to create a mystery around the groups first hit record in 1965, "Shakin' All Over", Quality Records credited the single only to "Guess Who?"

It was hoped that the public might assume the "Guess Who?" identity was deliberately masking several famous artists that were collaborating under a pseudonym.  The name stuck.

from ranker

The (DOOBIE) Brothers...I think you can guess.?

Stevie Nicks and Lindsey Buckingham’s San Jose, California (The Doobies' hometown) garage band were originally named The Fritz Reiner Memorial Band, after the famed conductor. His estate sued, and the name was abbreviated to just Fritz. I saw them live only once, at the 1968 Santa Clara Folk Rock Festival. They were the only local band (iirc) on the bill, opening for The Electric Flag (Fantastic! Mike Bloomfield, Buddy Miles, and four saxes!) and the doors (not so hot. Kinda "lightweight". Girls’ music ;-) .

Buffalo Springfield was named after a bulldozer brand that I think Stills noticed.