Source : Webster's Revised Unabridged Dictionary (1913)

Metronymic \Met`ro*nym"ic\, a. [Gr. ?; ? mother + ?, for ?
   name.]
   Derived from the name of one's mother, or other female
   ancestor; as, a metronymic name or appellation. -- A
   metronymic appellation.

Source : WordNet®

metronymic
     n : a name derived from the name of your mother or a maternal
         ancestor [syn: {matronymic}]