Yes, I have quite a few where I have the nickname only and not a full name in my PNL because I don't like the full name as much:
Bobbie (g)
CassieJamie (b)
LizzieMattie (g)
TessTom
I would probably use a full length name e.g.
Cassandra or
Elizabeth if I was naming a child for real or use them as middle names.
I also have
Ben and
Benjamin because I like both names equally.