I have a Ronan GG Grandfather I am almost positive is from Cork. I however have found some very possible matches for records under the name Cronin. These names sound so much alike I could see them being mistaken for one another, easily. I have come across Ronan's and Cronin's that are witnesses or sponsors on family records for the other and thought that it must be a mistake by the transcriber into the books. Does anyone researching either of these names know if they are connected by one being the root surname? Is it possible that either came to be by a transcription error and the family stuck with it ( I had this happen on my paternal side).