Holy cow, I wrote a book!
the story behind the name WiFi
(and it is not short for "Wireless Fidelity").
Michael Johas Teener
tells the story
where the name FireWire came from.
(Scroll down to "Why all these names?")
[9:30am - I originally had a link to a NY Times article,
but it was the wrong article and I can't find the right one,
so I'm just going to link directly to Michael Jonas Teener's