Thomas Crapper

Wikipedia ha an almost-right post about crap:

It has often been claimed in popular culture that the slang term for human bodily waste, crap, originated with Thomas Crapper (photo, top) because of his association with lavatories. A common version of this story is that American servicemen stationed in England during World War One saw his name on cisterns and used it as army slang, i.e. "I'm going to the crapper".
The word crap is actually of Middle English origin and predates its application to bodily waste. Its most likely etymological origin is a combination of two older words, the Dutch krappen: to pluck off, cut off, or separate; and the Old French crappe: siftings, waste, or rejected matter (from the medieval Latin crappa, chaff).[10] In English, it was used to refer to chaff, and also to weeds or other rubbish. Its first application to bodily waste, according to the Oxford English Dictionary, appeared in 1846 under a reference to a crapping ken, or a privy, where ken means a house.

Rico says he clarified that shit in an earlier post...