Thanks for the replies. Sinann, I used your link to 'The Core' and used the 'ends in' facility. There was nothing remotely like it in Leitrim, but I did come up with 'Knockacareigh'. What do you think? I wasn't sure what the first letter was, possibly a 'K' with a 'ck' in the middle. The groom, whom I thought might have originally come from Co. Cavan (hence the Cavan mention, Hallmark) could well have been living in Knockacareigh, PLU of Macroom, Cork W.R. at the time of marriage. The image is not available online, but I've attached an picture.
Thanks again.