Cimorene

I think it's just Scots - and I'm not sure that Northern Irish people who use Ulster Scots use it (there's a lot of political stuff going on in the name Ulster Scots, and many Northern Irish people - including people who speak in that manner - aren't in favour of the term. I recently read an argument, from a Northern Irish geographer, that the dialect in question is more connected with/descended from Elizabethan English than Scots). the term isn't used in mainstream Hiberno-English - my mother's grandfather, born in 19th century Scotland in a Scots and Scottish-English speaking environment, did use it, specifically to mean "going to a Presbyterian church." I'd imagine it went directly into Scots from either an Old Norse influence or if it was similar in anglo-saxon stayed in the old form in Scots while changing to "church" in English. (Obviously you're right and it's a Germanic word, like many in Scots).