Isagoge ad lectionem epistolarum divi Pauli apostoli, qua compositionis oeconomia, et germana dispositio indicatur. Opusculum recens. Benedicto Aretio authore.

Not only because there is an affinity between the words themselves, or because kings in the Old Testament, and many others, were binominal, but because I see that this was familiar in the first Jews, namely that they would sometimes assume the names of the nations among whom they were in exile. For Joseph is certainly called Saphnat Zaphnath-Paaneah among the Egyptians. Thus Daniel in Babylon is called Belshazzar, Ananias is called Shadrach, Azarias is called Abednego, Misael is called Meshach, so that it is established that the former names are Hebrew, Joseph, Daniel, etc., but the others were assumed for a certain reason, from the language of the nations with whom they lived. Thus it is altogether probable that Paul was Saul to the Jews, but because he was traveling in the Roman empire, he also assumed a Roman name,