"The Web site started out as Jerry and David's Guide to the World Wide Web but eventually received a new moniker with the help of a dictionary. The name Yahoo! is an acronym for Yet Another Hierarchical Officious Oracle, but Filo and Yang insist they selected the name because they liked the general definition of a yahoo: "rude, unsophisticated, uncouth." Yahoo! itself first resided on Yang's student workstation, "Akebono," while the software was lodged on Filo's computer, "Konishiki" - both named after legendary sumo wrestlers."
January 1, 1970
https://en.wikiquote.org/wiki/Yahoo!