Definition of papponymic in US English:

papponymic

noun

rare
  • A personal or family name derived from that of a grandfather.

Origin

Late 19th century; earliest use found in Mark Antony Lower (1813–1876), antiquary. From ancient Greek πάππος grandfather + -onymic, after patronymic.

Pronunciation

papponymic

/ˌpapəˈnɪmɪk/