1) Yahoo!
The word was invented by Jonathan Swift and used in his book 'Gulliver's Travels'. It represents a person who is repulsive in appearance and action and is barely human. Yahoo! founders Jerry Yang and David Filo selected the name because they considered themselves yahoos.
2) Google
It was a due to a spelling mistake. The name started as a joke boasting about the amount of information the search-engine would be able to search. It was originally named 'Googol', which means '1' followed by 100 zeros. After the founders Sergey Brin and Larry Page presented their project to an angel investor, they received a cheque made out to 'Google'.

3) HP
Named after the names of its founders Bill Hewlett and Dave Packard. They tossed a coin to decide whether to name it 'Hewlett-Packard' or 'Packard-Hewlett'.

4) Compaq
It was created using COM - for Computers, and PAQ - to denote a small integral object.

5) CISCO
Unlike to as most of the people believe, it is not an acronym. It is short for San Francisco.
6) Motorola
Paul Galvin named his company this when it started manufacturing radios and cars. The famous radio company at that time was called Victrola.
7) SONY
Came up from a Latin word 'Sonus' - sound, and 'Sonny' - a slang used by Americans to refer to a bright youngster.
8) SEGA
Shortened from Service Games of Japan, which originally imported pinball machines into American military bases in Japan.
9) IBM
After leaving National Cash Register, Tom Watson Sr. one-upped his former employer by calling his company International Business Machine.
10) Skype
The original concept was Sky-Peer-To-Peer which morphed into 'Skyper' and then finally 'Skype'.
11) Microsoft
The name was coined by founder Bill Gates, to represent the company which was devoted to MICROcomputer SOFTware.

12) APPLE
It was the favorite fruit of Steve jobs. He was 3 months late in filing a name for his business. So finally he ended up naming his company as Apple Inc.

13) DELL
Named after its founder Michael DELL.
14) ADDIDAS
Named after its founders Adolf Adi Dassler. His brother, Rudolf Rudi Dassler, found his shoe company called 'Ruda' which later became 'PUMA'.
15) eBay
Originally part of the Echo Bay Technology Group. The URL EchoBay.com was already taken by a mining company based out of Echo Bay, Nevada.
16) Coca-Cola
Named for Coca leaves and Kola nuts originally used as flavouring.
17) Canon
Named after Precision Optical Instruments Laboratory's first camera, Kwanon
18) Bridgestone
Named after the founder shojiro Ishibashi. His last name translates to 'bridge of stone'.
19) Audi
Taken from Latin for Horch. Founder August Horch's name was already being used by his previous auto manufacturing company.
20) Comcast
Coined from COMmunication and broadCAST.
21) Nikon
Shortened from the original name, Nippon Kogaku, which means Japanese Optical.
22) Nintendo
Came from Japanese name Nintendou where Nin means Entrested and Ten-dou means heaven.
23) NOKIA
Started as a wood-pulp mill which started producing rubber products in the Finnish city of Nokia.
24) NISSAN
Shortened from original name Nippon Sangyo which means Japan Industries

25) PEPSI
Named from the digestive enzyme 'Pepsin'.
26) Qualcomm
Short for Quality Communication.
27) Reebok
Stylized form of 'rhebok' which is an American Antelope.
28) Amazon.com
It meant to represent the potential for a longer volume of sales in an online bookstore as compared to a physical bookstore. (Renamed from Cadabra.com ).
29) SHARP
Named after the company's first product, the ever-sharp pencil.

30) Verizon
Combination of Latin word Vertas - Truth and the word Horizon.

31) Virgin
Suggested to founder Richard Branson by a friend who claimed they were 'complete virgins at business'.
32) ORACLE
Larry Ellison and Bob Oats were working on a consulting project for CIA. The code name for project was 'Oracle' as the CIA saw this as a system to give answers to all questions. Project was designed to help use the newly written SQL code by IBM. Project was eventually terminated by the founders decided to finish what they had started. They kept the name 'Oracle' and created RDBMS engine. Later they kept the same name for the company.

33) AT&T
Stands for American Telephone and Telegraph Company.

34) LEGO
Coined from the Danish 'LEg GOdt', which means to play well.
35) Vodafone Short for Voice, Data, Telefone.

36) Volkswagen German word for 'People's car'.
If you know any other than those mention above please share it by commenting below.. :)