I hate the name my fiancé picked

So my fiancé and I faught a lot about baby names. I told him he could choose the middle name. I wanted her first name to be Sophia and he wants the middle name to be Persephone [per-sef-uh-nee]. I HATE that name so much. It doesn't flow well at all. I try to get him to change it but he gets mad and says "You said I could choose a middle name!" I feel so bad because I technically did say that, but I just hate the name. What should I do? I really want to put my foot down and say no but I also don't want him to feel like he doesn't have a say.