Its personally not a name I would choose.
I mean it has a great meaning, and if a someone likes it for their little girl then thats great.
But I don't like is because

1)Its hard to pronounce by looking at it.
2)Its too popular.
3) It made up sounding.

Nevaeh is personally a name I would not choose. I don't understand the point of naming someone a word spelled backward. Why not just name her Heaven?

As far as Zander. I like that but spelled Xander (as in a nn for Alexander).

Nevaeh is becoming very overused and sounds undignified. Rileigh is OK but spelled Riley and only for a boy. The name Jaysie looks made up and is way too cutesy for anyone past their teenage years. Piper just isn't my style; to me it's one of those names that's too masculine for a girl and too girly for a boy. Zander is cool, but I would name a boy Alexander and then call him Xander (with an X, not a Z) as a nn.

Jeremy J.R

I'm confused is the name Jeremy or Jeremy J.R.? If he's the second Jeremy then of course, add the J.R. Jeremy is one of those names that was climbing in popularity for a while but it kind of settled. Not very unique, but it is uncommon right now. Go for it.