I don't like the sound of it.
Pyoo.
The meaning is nice abstractly... as a namey idea.
Innocent, clean - spiritually.
But my primary and strongest association, on seeing the word Purity used as a name, is with the notion of supposed sexual "purity" that belongs to people with guilty sexual consciences, who frequently have an aggressive dread of the sexuality of others (usually females). So for that reason I get a creepy vibe. I'd have to know the people to really pass judgment, but that's my immediate reaction to seeing it used as a name for a baby. Of either sex but esp. a girl.
Neveah is eh, alright. I like it fine as a real person's name, it works fine, sounds namey, isn't worse than any other invented name.
Abstractly I don't like the idea of "heaven" as a baby-name. I don't get how that is namey. It isn't as creepy as Purity though.
- mirfak