Someone's family name.
Hay apulīdun Puhwi' ya hi Gimmangob.
The family name of Puhwi' is (his father) Gimmangob.
Traditionally family names were not used. In addition to one's given name, he or she would be identified by his or her father's given name. With the recent introduction of family names, one's father or grandfather's given name has begun to be used as a family name.