Adobe - Came from name of the river Adobe Creek that ran behind the house of founder John Warnock.
Apache - It got its name because its founders got started by applying patches to code written for NCSA’s httpd daemon. The result was ‘A PAtCHy’ server -– thus, the name Apache.
Apple Computers - Steve Jobs was three months late in filing a name for the business because he didn’t get any better name for his new company. So one day he told to the staff: “If I’ll not get better name by 5 o’clock today, our company’s name will be anything he likes…” So at 5 o’clcok nobody come up with better name, and he was eating Apple that time… so he keep the name of the company ‘Apple Computers’.
CISCO - Its not an acronym but the short for San Francisco.