I'm afraid I can't be of much assistance with this. While John ( not Jonathan) is a family name there is no sign of Edmond as a family name. I wonder if your relative is a Jonathan however since this is a name associated with the McElderrys from London(Derry)- The Mccabe connection. If you research the history of the civil war you'll find that Mcelderry's ( the Ballymoney connection)( as well as your relative) featured prominently on both sides of the conflict ( brothers who were relatives of my wife's fighting against each other). Apart from that I can't help , I'm afraid. If I encounter anything further I'll let you know.