I was browsing through the Orillia messages when I ran across your message. I can't give you much but, I can say this.
There were Antonias in our neighbourhood where I lived at 371 Peter St N, way back in to 1935 - 1944. They were Catholic, and there is a Catholic Church on West St, near Coldwater Rd.
I have no idea (can't remember) what their given names were but maybe this will give you something to work with. Hope this helps.