DF not budging on name

Addnyc

DF wants to name the baby Barbara after his grandmother if it's a girl.    I want to make him happy, as I know she was such a big part of his life, but I really don't like the name, not to mention what about MY mother or grandmother?  I've tried talking to him about pitting in in the middle name,  ut he's adamant, and stubborn...Any advice on how to approach this?