Arrius

• (Classical) IPA^(key): /ˈar.ri.us/, [ˈärːiʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈar.ri.us/, [ˈärːius]

Probably from Oscan *𐌀𐌓𐌓𐌉𐌄𐌔 (*Arries).[1]

Arrius m sg (genitive Arriī or Arrī); second declension

1. a Roman nomen gentile, gens or "family name" famously held by:
   1. Quintus Arrius, a Roman praetor

Second-declension noun, singular only.

¹Found in older Latin (until the Augustan Age).

• Arria

Borrowed from Ancient Greek Ἄρειος (Áreios).

Arrius m sg (genitive Arriī); second declension

1. Alternative spelling of Arīus (given name)

• Arriānus

• Arrius in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Souter, Alexander (1949) “Arius”, in A Glossary of Later Latin to 600 A.D.‎, 1st edition, Oxford: Oxford University Press, published 1957, page 22