I haven't a clue what the first Catharines last name was. Still trying to find that out. I can not seem to find much info out of Islay, Scotland. I do know, however, that my wife's McNevins, (for the most part), settled in Huron County, Ontario and spread out from there in the 20th century. Most are still in Ontario. Email me and I can send you a some deeper info and you may see, for yourself, if there is a connection.