Pretty amazing that she should choose a variant of
Peter!
I like
Piers a lot - OK, I did name my own son
Peter, not because of Spidey but for personal reasons.
Piers doesn't seem to happen where I live, which is a pity. I suspect it might be a 70s name in the UK, for what that's worth. Oh, and Americans seem to pronounce it like
Pierce, with an s therefore instead of a z, which I don't enjoy.
I've never heard of
Piers Anthony!