matronymicpatronymic
Matronymicpatronymic is a compound term referring to a naming convention where an individual's surname or given name is derived from both their mother's and father's given names. This practice is less common than purely patronymic or matronymic systems. In such a system, a child might take a portion of their mother's given name and a portion of their father's given name to form their own. For example, if a mother's name was Anya and a father's name was Ivan, a child might be named Ivan-Anya or Anya-Ivan.
This naming practice can be found in various cultures and historical periods, though it is not widespread.