The use of Kit Cat or Kit Kat for a food harkens back to the 18th century when mutton pies served at the Kit-Cat club (owned by a man called Christopher Cat) became so called.  But the origins of the confectionery KitKat stem from a note in an employee suggestion box at the Rowntree factory in York, which asked for a “snack that a man could take to work in his pack”.  Thus, in 1935, what we now recognise as a KitKat was launched (although it was only named KitKat two years later).  And now – worldwide phenomenon.  We hope they gave that employee some kind of plaque at least.