I am intrigued to hear your story. I don't know the name Borger but I will inquire of my cousin who lives on Decatur Island and might possibly have heard the name in connection with family. She still has a lot of family correspondence from 1890 and later. We know that our Tlingit great grandmother kept a communication with a wide number of her native people. I will get back to you if I find any information on Borger lines in my area.
I see there is an online record of a Joseph Borger b 1870 buried at Port Blakely in 1976. This must be the info you found? Thanks, hope we find common connections.