I don’t have Jay’s in my family tree but in case anyone is out there searching for them I found an old newspaper clipping in my grandmother Beatrice Jordan’s papers.
The newspaper mentions Mrs. Jay of Cadieux street, Montreal, her son’s names were George Arthur, John and William. The connection to my family is likely George Arthur Jay who was with the Signalling Company. My grandfather John M Dever was also a Signaller, and George Arthur Jay likely a friend.
If you are a Jay descendant let me know as our families may have known each other.