[Opinions] I think it's absurd. (m)
To me, naming a baby Nouveau - or any other word meaning new - is as cheesy and silly as naming them Baby, Tiny, Cutie, Bubbykins or any other name that indicates that the parent can't see past the first couple of months of baby-ness.
Can you imagine the irony of a 90-year-old Nouveau? I can, and it itches :-(