Yiddish names are listed In the beis shmuel at the end of hilchois gittin. “
When the Gemarah was written down, there was no such thing as Yiddish. Names written in the Beis Shmuel have nothing to do with Gemarah per se. That is not a ra’ayah.
I wonder of Pia is in any way derived from Puah (though the Italian “pious” does make sense also, as many Jews lived in Italy).