The Collaborative International Dictionary of English v.0.48:

Gynne \Gyn"ne\ (g[i^]n"ne), v. i.
   To begin. See Gin. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

Gynne
    n 1: English comedienne and mistress of Charles II (1650-1687)
         [syn: Gwynn, Gywn, Gynne, Nell Gwynn, Nell Gywn,
         Nell Gwynne, Eleanor Gwynn, Eleanor Gwyn, Eleanor
         Gwynne]