The recent newsletter for the American Copy Editors Society explains the word "namesake."
A namesake is a person or thing named after someone or something else:
RIGHT: Stephan Pyles ate in his namesake restaurant.
WRONG: The restaurant Stephan Pyles was visited by its namesake owner.
The person providing the name is the eponym, not the namesake (I looked it up).
More EDITOR@WORK blog entries
Blog entries from The Auto Racing Journal
(a book of great stories about the Intimidator)
(the book of great NASCAR stories)
More blog entries by Tom Gillispie
Anecdotes by Tom Gillispie