Love Petra.
Peter is, has been and (as far as I can tell) will always be my favorite name for a boy. So
Petra starts with a huge leg up.
Petra is one of those under-the-radar kind of classics. It's elegant but has the potential (and unexpected) nn
Rocky.
Petra Vivien is my stock combo for it. :0) I keep wanting to use a middle name starts with an L,
Petra Linden,
Petra Lilith. But "petrol" results. :0/