A name derived from the name of your mother or a maternal ancestor

WordNet Word definitions in WordNet
n. a name derived from the name of your mother or a maternal ancestor [syn: matronymic ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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. -- n. A metronymic appellation.

Wiktionary Word definitions in Wiktionary
a. (alternative form of matronymic English) n. (alternative form of matronymic English)

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"derived from the name of a mother or maternal ancestor," 1881, from Late Greek metronymikos "named for one's mother," from meter (genitive metros ) "mother" (see mother (n.1)) + onyma (see name (n.)). Related: Metronymically (1822).