From all the information that I have read, it would appear that the name has nothing what so ever to do with the natural substance of bone, being part of the skeleton of a human or of any other living form.. But has it's origins in a place name in Normandy, France, where the original name was Bohon. Humphrey son of Richard de Marie, took this name, and brought it with him when he arrived in England with William the Conqueror in 1066, but changed it to Bohun. It was changed several times down the centuries, and being a French name, it was said that the English couldn't pronounce it correctly. Very similar to the French name of Beauchamp, which was changed to Beecham, by the English.