It was the name of a distant relative, pronounced pe-LAG-ya.
Peggy and
Gia would be unusable in Poland. In English,
Peggy could work, but I don't see how
Gia would unless it was pronounced pe-la-jee-a. Either way, if I had a goose, that's what I'd name it.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080