What does Cupronius mean in Latin?

Cupronius, a proper noun, means “a Roman nomen gentile, gens or "family name"”.

What is the genitive of Cupronius?

The genitive singular is Cuproniī. Cupronius is masculine, second declension.

In classical Latin, [kʊˈprɔ.ni.ʊs]; in ecclesiastical (church) Latin, [kuˈprɔː.ni.us].

proper noun · masculinesecond declension

Cupronius m sg (genitive Cuproniī or Cupronī)

Classical[kʊˈprɔ.ni.ʊs]Ecclesiastical[kuˈprɔː.ni.us]

masculinesingulara Roman nomen gentile, gens or "family name"
(please add an English translation of this quotation)EDCS-13100093. L(ucius) Cupronius / L(uci) f(ilius) Quir(ina) Rufus / aediculam vetus / tate dilapsam am/ pliato opere / de suo restituit / ex d(ecreto) o(rdinis)

Perhaps etymologically connected to Proto-Italic *kupros, presumably with the suffix -ius.