` :I just looked up the reference British Agriculture: Texts for the Zoo-Archaeologist and it supports ``Buck goat`` as an archaic usage as the quote is from 1680. This agrees with the OED's etymology. Note also that many cases where  American usage differs from British (or Commonwealth)  usage and the  American usage is corresponds to the 17th C English usage. Eg griddle, gotten, herb (with the h aspirated) are all archaic in England. See American and British English differences.`