I'm not at all sure about the Celtic connections either. Why just Derbyshire, which has more to do with the Saxon "Pecsaetan" – the dwellers of the pecs or hills (See History of the Peak District) than Celts. If it is Celtic, why would it survive here and not in the more obviously Celtic areas? I think those pesky Victorians had an awful lot to do with romanticising Celtic mythology as well as folk song and dance.

Just my 2p.

Interesting subject anyway.

Dave.