Yahoo started off as a list of cool links selected by founders David Filo and Jerry Yang, both Ph.D. candidates in electrical engineering at Stanford University. As the list grew, the duo split up the list into separate categories, then subcategories, and then the Yahoo we know today started to take shape.
At first, they called this service "Jerry and David's Guide to the World Wide Web,” but decided they needed a quicker moniker. After pouring through dictionaries, the pair came up with "Yet Another Hierarchical Officious Oracle," or “Yahoo!”
They also liked yahoo’s non-acronym definition: "rude, unsophisticated, uncouth."