Leaside has a similar problem. Nobody associates Leaside with Bayview, the retail there is called South Bayview Village BIA and not Leaside BIA for a reason.
And I thought the same regarding Chaplin. I don't mind if Chaplin is renamed Forest Hill, that is kinda the center of Forest Hill, up the street from Forest Hill Secondary, and next to both Spadina and Chaplin.
Problem with Sunnybrook is that the hospital is at Bayview&Lawrence, not at Bayview&Eglinton. Plus more people associate Sunnybrook with Sunnybrook Park which is on Leslie, not Bayview.
This will be further exacerbated when Sunnybrook Plaza gets redeveloped into condos.