If you ask anyone on the street what “WiFi” stands for you'll get a multitude of answers that will all lead back to some variation of "Wireless Internet". The tech community will tell you the term stands for "Wireless Fidelity". Both, however, are incorrect.
WiFi doesn't stand for anything. It is not an acronym. There is no meaning. The term WiFi was invented by a company called Interbrand. Interbrand has also created such well known branded names like "Prozac", "Compaq", "OneWorld", and "Imation". They even created the company name “Vivato”.
The governing body of WiFi, called the Wireless Ethernet Compatibility Alliance hired Interbrand to come up with a name. Simply put they thought "WiFi" was a much more palatable and catchier term to the street than it’s’ more technical scientific classification called IEEE 802.11(x)
After all, we don't say "Honey, can you pick up some Solanum lycopersicums at the store"? We just say grab some tomatoes please.