I didn't think you could trademark someone's last name?
https://en.wikipedia.org/wiki/Bj%C3%B6rn_Borg
A search of borg in the patent office shows the name used a lot: http://tmsearch.uspto.gov/bin/showfield?f=toc&state=4806%3Av...
If you look at https://en.wikipedia.org/wiki/Apple_(name) , the surname 'Apple' is used quite a bit.
https://nissan.com/Digest/The_Story.php
I hate how easily corruptible trademark/copyright/patent rules are