No help needed. Just another type of family name origin I found today.
In this case in Pays Basque (the Basque country) in France.
This tweet in french explained family names varies from one generation to another: until 19th century the first born took the name of the house. Another particularity of Pays Basque was the strict primogeniture: the first born, male or female, inherited everything.
From French Wikipedia: newcomers are always assigned a house name but this name can refer to the occupant, his first name, his origin or his profession!