matronymic
🇺🇸
/ˌmætrəˈnɪmɪk/
🇬🇧
/ˌmætrəˈnɪmɪk/
A name based on your mother's or a female ancestor's name, often by adding a prefix or suffix.
The child's matronymic was created by adding 'son' to the mother's maiden name.