Google:
The name started as a joke boasting about the amount of information the search-engine would be able to search. It was very first named as"Googol" a word of the number represented by 1 followed by 100 zeros. But later founders-Stanford graduate students Sergey Brin and Larry Page represented their project to angel investor, and from whome they received a cheque made out to "Google'.Yahoo:
The name was derived by Jonathan Swift and was used in his book 'Gulliver's Travels'. it represents a person who is revolting in nature and action and is barely a human. Yahoo! founders Jerry Yang and David Filo finalised this name because they considered themselves as yahoos.Micro soft:
Coined by Bill Gates to represent his company that was devoted to MICRO computer
SOFTware. Originally named it as Micro-soft, but then the'-' was removed.
Adobe:
Came from the name of the river Adobe Greek that ran behind the house of founder John Warnock.
Corel:

The name was arrieved from the founder's name Dr.Michael Cowpland. The logo stands for COwpland REresearch Laboratory.

Apple computers:
Steve Jobs was three months late in filling a name for the business, because he didn't get any better name for his new company. So one day he told the staff," If I do not get a better name by 5 O'clock today, our company's name will be anything I like." Since at 5 O clock no body came up with a better name, and he was eating an apple at that time (favourite fruit of Steve Jobs), so he kept the name of the company as " Apple Computers".
Cisco:
It is not an acronym as is popularly believed it Short for San Francisco.Hewlett Packard:

Bill Hewlett and Dave Packard tossed a coin to select whether the company they founded would be called Hewlett-Packard or Packard-Hewlett. And thelosser was Bill, but not Dave
eBay:

The founder of eBay, Pierre Omidyar , had a web consulting company called Echo Bay Technology Group. Echobay.com was already taken when he tried to register it, so he selected the ne name eBay.Com instead.