Got this list from someone else, so I can't vouch for the accuracy. I have heard about Pink Floyd, Iron Maiden & Jethro Tull, but the others were new to me. Did not know about Steely Dan!

Origins of Rock Band Names:

The Bay City Rollers: Came up with their name by sticking a
pin in a map of the world. It landed on Bay City, Michigan.

Buffalo Springfield: Members of the group were stumped for
a name. A member of the band was looking out their manager's
window at a construction site in Hollywood, when he spotted
a steamroller with the brand name "Buffalo Springfield."

Iron Maiden: A medieval torture device.

Jethro Tull: Named after the 18th century British inventor
of the seed drill.

Pink Floyd: An amalgam of two American blues artists, Pink
Anderson and Floyd Council.

Steely Dan: Based on the name of a dildo in William
Burrough's novel, The Naked Lunch.

Three Dog Night: It is a practice of Australian aborigines
to sleep with three dogs on particularly cold nights.

UB40: Named after the British unemployment benefit form.

The Velvet Underground: Lou Reed lifted the name from a
title of a cheap paperback novel.