The Collaborative International Dictionary of English v.0.48:

Huguenot \Hu"gue*not\, n. [F., properly a dim. of Hugues. The
   name is probably derived from the Christian name (Huguenot)
   of some person conspicuous as a reformer.] (Eccl. Hist.)
   A French Protestant of the period of the religious wars in
   France in the 16th century.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Huguenot
    n 1: a French Calvinist of the 16th or 17th centuries