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There are a few common Italian male names end in -a, though.

Andrea, Luca, Nicola are the most common.

Aren't most of these cases of dropping the final s and maybe a vowel from a latin names instead of adding a diminutive a?

Andreas Lucas Nicolas, etc. (perhaps with different spelling in Latin)

> Aren't most of these cases of dropping the final s

Yes, but also because those names were originally Greek.

All masculine names in Italian that end with -a come from Jews, old testament, with the exceptions of Enea and Nicola.

All three examples in GP are ancient Greek origin.

Andrea.