Chris Epps - murderer and Frankenstein monster builder in Buffy
http://en.wikipedia.org/wiki/Some_Assembly_Required_(Buffy_the_Vampire_Slayer)
Howard Epps - Serial killer in Bones
http://en.wikipedia.org/wiki/List_of_Bones_characters#Howard_Epps
Don, Charlie and Alan Eppes (ok, minor spelling difference) - in Numb3rs
http://en.wikipedia.org/wiki/Numb3rs
Could they be related?