The nomen
Petronius appears to be a patronymic surname derived from the Oscan praenomen
Petro or
Petrus, the Oscan equivalent of the Latin Quartus, fourth, and making
Petronius cognate with a number of obscure Latin gentilicia, such as Quartius and Quartinius.
[The Numeral Praenomina of the
RomansHans Petersen
Transactions and Proceedings of the American Philological Association
Vol. 93 (1962), pp. 347-354 (8 pages)
Published By: The Johns Hopkins University Press]
An alternative derivation would be from the cognomen
Petrus, a rustic, although this may also derive from the Oscan praenomen.
Petronius belongs to a large class of gentilicia derived from other names ending in -o, most of which are plebeian.[The Origin of
Roman Praenomina Author(s):
George Davis Chase Source: Harvard Studies in Classical Philology, 1897, Vol. 8 (1897), pp. 103-184 Published by: Department of the Classics, Harvard University]