@farmerman,
A couple of my friends were able to explain, to FB's satisfaction, why they were using those names and were able to retain them. Others modified their user names.
Another friend's real family name has Coyote as part of it. FB does not allow anyone in their family to use it. When I tried searching for names like Dave Coyote on FB, all kinds of interesting variants came up - but no Dave Coyote.