My SO is making me mad..

Cynthia • Age 23. Had my beautiful daughter 10/24/15 ❤️
We are having a daughter and he didnt like the name i wanted for her so then i agreed with one of the many names he had suggested (this was months ago) and i picked the middle name which will be my grandmas name that passed away but the problem now is that my baby is due in a month and now he says he doesnt like the name he picked anymore so that he has the right to change it because i picked the middle name. That is not fair to me at all i already told my close family the name we chose and now just because i want my grandmas middle name he wants the first name to be a name from his family for no reason at all im so mad and hes just confusing me! Is he wrong for doing this now?? And now its making me not like his family just because of him hes doing it on purpose so i dont want any of their names i want the name he had chose before 😡 do i just ignore him??!