If the first name is your own name, then it is clearly protected under the UDRP since you are known by the name. Otherwise, a first name is comparable to a common word. Here are two first name personal decisions and one last name.
TAMMY.COM: Here, the owner was not known by the first name and used it for an adult web site.
DONNA.COM: Here, the owner's first name was Donna (although there was an issue with respect to a third party tech. host being listed as the registrant).
DRTAVEL.COM: This was a real strange one. The owner of the domain name was a lawyer who referred to himself as Dr. because he had a Juris Doctor degree. His father owned a trademark for Dr. Tavel for a line of optical shops and sued him! The son prevailed.
http://www.arbiter.wipo.int/domains/...2000-1654.html http://www.arbiter.wipo.int/domains/...2001-0875.html http://www.arbforum.com/domains/decisions/96478.htm