The "Irish Bouzouki" is another case in point of a new instrument pinching an existing name, since it's really got very little to do with the Greek Bouzouki.
I don't believe that all the worthwhile instruments have yet been invented.
For example I'd like to see someone experimenting with variations on the hurdy gurdy system - with the strings sounded by a turning wheel, I mean.
I can imagine a variant in which there was a fretboard like a mountain dulcimer, rather than the sort of keyboard hurdy gurdies have. It might work pretty well.
Or possibly not... I'd like to see it done I said -I'm not too sure I'd like to hear it, at least until the bugs had bee en well and truly ironed out.
I suppose you could call it a hurdimer gurdimer.