WordNet (r) 3.0 (2006):

name dropper
    n 1: someone who pretends that famous people are his/her friends

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "name dropper":
   Brahmin, adventurer, bourgeois gentilhomme, egghead, elitist,
   highbrow, mandarin, newly-rich, nouveau riche, nouveau roturier,
   parvenu, pig in clover, prig, snob, social climber, sprout,
   status seeker, tufthunter, upstart, would-be gentleman