Bowl, it won't be shortened. The great thing where we live is people ask you what you want your child to be called and they call them that. If i introduce him as Dominic then that is how he will be known as. Nurseries only use the full version of the names, no nicknames.
I call my Dd Bella but in nursery she is called by her full name, Isabella. I am sure i won't be using Dom or Jonny as NN. I am more the "pumpkin" and "monkey" NN person.