Fankle, Hurkle Durkle etc . sound Germanic .
Sadly , the Scots tend to ignore the Germanic input into the lingo , whereas Gaelic is lauded and even used on street names in areas with little Gaelic association .
A couple of years ago the Macneil Y-DNA project produced some interesting results , usually punters love to think they might have "viking" ancestry , but not quite in this case .
http://www.heraldscotland.com/news/13197315.Macneil_clan_shocked_as_DNA_checks_force_rewrite_of_history/