matronymic
Concise Oxford English Dictionary © 2008 Oxford University Press:
matronymic /ˌmatrəˈnɪmɪk/ (also metronymic)
▶noun a name derived from the name of a mother or female ancestor.
– origin C18: from L. mater, matr- ‘mother’, on the pattern of patronymic.
'matronymic' also found in these Oxford entries:

