There are a few common Italian male names end in -a, though.
replyAndrea, 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?
replyAndreas Lucas Nicolas, etc. (perhaps with different spelling in Latin)
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replyAll masculine names in Italian that end with -a come from Jews, old testament, with the exceptions of Enea and Nicola.
replyAll three examples in GP are ancient Greek origin.
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replyHe's talking about Spanish, not Italian, a different language?
replyLots of nicknames in Spanish end with an A though, Juanma and Joserra, basically putting together Juan Manuel and Jose Ramon.