Per:
[1] Stim, R. "Intellectual Property. Patents, Trademarks, and Copyrights" West Legal Studies.
[2] Black's Law Dictionary 5th ed., (West Publishing, 1979).
A personal name can be used as a trademark if the name can be proved to contain "secondary meaning" which translates into 5 years of continued and exclusive use of a mark. lack's Law Dictionary (Fifth Edition) defines the doctrine of secondary meaning for the purpose of trademark law as "[A] ... party through advertising or massive exposure ... [establishing] its trademark in the minds of consumers as an indication of origin from one particular source."