What's the difference between matronymic and metronymic?

Matronymic

Definition:

• (n.) See Metronymic.

Example Sentences:

• (1) I've realised that giving children the matronymic surname at birth is rare.

Metronymic

Definition:

• (a.) Derived from the name of one's mother, or other female ancestor; as, a metronymic name or appellation. -- A metronymic appellation.

Example Sentences: