I also love
Ambrose & have come across the same problem... the only nn I can think of that I would use is
Rose. But honestly, I don’t think it absolutely needs a nn. People will get used to
Ambrose on a kid and eventually won’t think of it as sounding too formal and will just associate it with the child. I totally get the desire for a nn, but don’t let the lack of one put you off from using the name if you really love it.
we all share the same sky