What does Google mean?
The word Google which is the name of famous search engine,is a play on number googol.A googol is equivalent to a one followed by hundred zeros,and is indeed an extremely large number.This term reflects the infinite and eror increasing volume of information which is currently available on the internet.
The word 'googol'was introduced by Milton sirotta,hwo was the nephew of the famous american mathematician Edward kasner.It was made popular through the launch of the book 'Mathematics and the imagination',which was written by Kasner and James newman.
The company google was founded in 1995 by Larry Page and Sergey Brin,who met as computer science graduates from Stanford university.They originally colaborated together on a search engine called BackRub.Following some experimentation with this project,they boughts some cheap computer equipment and setup Google's first data center in dorm room.Google is now widely regarded as the best search engine available.
In short:Google is a search engine,named after a number (10^100)

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source:www.blurtit.com/4235129.html

What does Yahoo! mean?
If one users the dictionary,the word yahoo means a rough and rugge a person or a manifistation of the arrival of an expectation,a shout manifesting a celebration of something.A web definition expounded the meaning that states:Yet another hierarchical officious oracle.
Yahoo:yah-hoo-,yeu-,yah-hoo
Noun plural Ya:hoos
In swift's Gulliver's travels,one of a race of boutes,having the form and all vices of humans,who are subject to the Houyhnhnms (lowercase) an uncultivated or boutish person;lout;philistine;yokel.(lowercase) a coarse or boutish person.
source:dictionary.com

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The hebrew word yahoo(or yahu) is a name of G-d.It is commonly found at the end of people's names.It represents a Divine attributte added to the name.For example,yeshayahu (isaiah) means G-d's redemption,yirmiyahu (jeremiah) means fear of G-d.I sometimes wonder if the internet company yahoo!became such a major success simply,because G-d likes the name they chose!
source:ohr.edu/ask_db/ask_main.php/283/Q1/