Jás and
Zosia wouldn't be used. Jás isn't a name at all in Polish. Jaś is, but it's only ever used as a nickname for
Jan. Same with
Zosia and
Zofia.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080