I was thinking Quinn would name the child after a peer or teacher he respected. Leo, or Arthur if its a boy.
Maybe Helen, or Layla's mother's name that I cannot remember right now if ita a girl.
Galen
It means calm or peaceful. Quinn goal for getting stronger was always to tear down the system of oppression of the weak and to protect and provide peace for those he loved and cared about.
Plus Galen Talon sounds cool.
If a girl Lilith (Means of the night matches with Layla's name which also means night and fits the vampire theme)
For a boy Blake (Means dark in old English going for with the night theme and references Quinn's shadow.)
For either a boy or girl Vesper (Which can mean evening star.)
I think it should be a girl and name her Lucy after Laylas mom makes the story a bit less Quinn central since everything revolves around him but if is male Lucius would be great to still honor Lucy's sacrifice for her daughter.
What ever happened with Peter? I know he got separated from Quinn when Quinn got locked away as a celestial. But why haven't we heard anything about him again?
Well it looks like Quinn's life is about to become a whole lot more interesting, but if im being honest, I personally think that Quinn and Layla should name the child something unique.