From someone born & bred gaelic spoken....
"Depends on context - could mean 'certain', or if it's a noun it would mean 'churn', as in a container for making butter"
I mentioned I had found the word 'certain' but the spelling was different & the reply was.....
"Some words change spelling due to grammar rules! I reckon in this case it's probably a churn, but without any more context it's tricky"
I mentioned the family were Farmers & the reply was that it probably related to that.
Hope that's helped?
Added, Are you certain of the spelling as another has mentioned possibly a place name (in the context of the use)?
South Uist, Inverness-shire, Scotland:- Bowie, Campbell, Cumming, Currie, MacDonald, MacInnes, MacIntyre, MacKinnon, Steel(e), Walker
Cullen, Flannigan (Derry)
Donahoe/Donaghue (variants) (Cork)
Mellon, Tol(l)and (Donegal & Tyrone)
Newcastle-upon-Tyne & Durham (Northumberland):- Harrison, Jude, Kemp, Lunn, Mellon, Robson, Stirling
Kettering, Northampton:- MacKinnon
Canada:- Callaghan, MacKinnon, MacPhee