-ADOBE-
This came from name of the river Adobe Creek that ran behind the house of founder John Warnock..
-APPLE COMPUTERS-
It was the favorite fruit of founder Steve Jobs. He was three months late in filing a name for the business, and he threatened to call his company Apple Computers if the other colleagues didn't suggest a better name by 5 O'clock that evening..
-CISCO-
It is not an acronym as popularly believed. It is short for San Francisco..