We know that the Charmed one's family's normally name children with "P" names (again mostly) Phoebe has 3 daughters Prue, and Parker and 1 un named daughter what do you think her other daughters name is that begins with a P?
so you have PJ (prudence joanna) , parker and we will probaly know the name in the comics of charmed but i think with a P it could be Pricilla , payton , penelope, perri , ........ just naming :D
and her last baby's name would be paige because prue was the oldest off of charmed then it was piper was the middle and paige is the youngest so she named her daugher's prue and parker because prue died and prue was the oldest sister then she got parker because piper was the middle before prue died then she became the oldest so that's why i think she named her 2 daugher's prue and parker then the baby would be paige there long lost sister so that's why she would name her baby paige and because they became in charmed again piper phoebe and paige became close