Is that tone really necessary?With no respect whatsoever, "wrong'un" literally means "the one that turns the wrong way". It doesn't specify any particular mechanism. You've obviously not played in a very wide cricketing environment if you've never heard people using that term. It predates doosra (a relatively modern innovation) by a quite considerable degree.
Also, if we take your argument to extremes, an offspinner literally means a ball with off spin so therefore a googly is an offspinner.