Composed by Ian Hardie, presumably as a fiddle tune since that’s the instrument he plays it on, but I wonder if he also plays it on pipes. It’d make a great GHB/SSP/Border pipes tune. More "Borders" than "Northumbrian", this one, I reckon. It’s apparently been recorded by Fintan Vallely, so there’s your Irish connection if you need one.
The modern, local pronunciation is "Chee-viot". You’ll find other ways of pronouncing it e.g. "Cheh-viot", "Sheh-viot" etc for placenames in the US and NZ, and also to refer to a type of sheep and type of cloth, but these were all named after the hills on the English/Scottish border anyway. That said, I’m not sure whether any of these variants indicate an earlier pronunciation or whether they’re all just corruptions of the original.
Re: Cheviot Blast
I think Ian didn’t exactly play the same rythm in the 4th part than this here in abc. It don’t match when I try to follow the beats.