I know very little about trademarks, let alone trademarks on peoples names....
But
Kathryn MacGregor:
http://tinyurl.com/39msx
Returns (0 results)
Where as....
Jenna Jameson
http://tinyurl.com/2pr62
Returns a registered trademark for porn star Jenna Jameson.
She doesn't seem to have a registered trademark (R) for her name... but like I said, I'm not sure about the laws when it comes to actual peoples names.
I'll see if I can dig something up about peoples names, I do remember something about this....