Stower and Mr Red - if you read the mudcat thread http://www.mudcat.org/thread.cfm?threadid=13582 (link in my previous message, Callino Custurame) and this article http://www.mudcat.org/olson/viewpage.cfm?theurl=BMADD.html#SUMMER I think you will learn what you need to know.

I dont think the River Soar needs to be evoked; there was a tune named for the Suir, and it seems likely that the other proposed Gaelic derivations for Callino Custurame were made up by people who had the language but didnt recognise the place name.

No, I wouldnt know how Irish was pronounced in centuries gone by, but present day pronunciation of "[is] cailín ó Chois tSuire mé" is close to Coleen - o- coshturamay [the lenited c is difficult for English speakers and tends to get reduced to a plain c]