Hi Pamela,
I was intrigued by the Crowe record / location but can not find it in a search of RC marriages in the whole of Ireland nor my spreadsheet of RC marriages. Could you tell me where to find it?
I have a one name study for Crowe in Ireland but it is mainly Tipperary at present as that is where my roots are. You are wuite right about Dwyer and Ryan, they are the most common names in the area and working with them is difficult. I have many, many Ryans attached to my tree and in the other records by far the most common name. I know an American guy who researches RYan but only in one Parish for that reason.
Richard Dwyer marriage I found and both are from Curraheen, Kilcommon and would have known my relatives, some of whom were in Curraheen itself. Note the spellings in registers were often phonetic, no standard spellings! :) Also Turraheen is in this area too. The sponsors were Michael Ryan Johanna Hays and William Hays. Hayes is another common name but all three would be siblings or married to siblings normally which may help your research. I found the third one too and the same would apply to the witnesses there too except they are more Ryans and Dwyers! I note the priest got confused with the spouses names and crossed out one to correct it.
I do not envy the puzzle, in fact Ihave often wondered if it could be done. With other names I have diligently gone away and found all the relevant surnames in a Parish and painstakingly pieced together small family trees until I have relavant fmilies to make a connection. With distinctive names and small populations it can be done but takes time and effort, access to the records online and a spreadsheet etc. My motive was strong too, so it was worth the effort. It would be good to know why you would like to associate them together?
Kilcommon is not such a busy parish as others are so this may be in your favour but if they spill into the neighbouring parish, say Clonoulty.
Best of luck and if I can help let me know?