FTM choosing son’s name

for the last 4 months or so my boyfriend and I have been trying to come up with a name for our baby boy. he’s going to be our first child. His family came up with the name Ian and we both liked it so we’ve been tossing that name back and forth for the last couple of months. As a joke one day, my boyfriend said he liked the name billion...from the jump I said i didn’t like that and would not be naming our child that but i was still open to choosing another name together if he didn’t really love Ian. For weeks now i’ve been trying to get him to sit down with me and talk about first and middle names that we both like and agree on. he has come to the conclusion in his mind that i picked out the name Ian so he should get to pick our son’s middle name. he won’t give any other suggestions other than billion. i feel like he’s taking this whole situation as a joke and not being an adult about it. This is our first child and he only gets one name that’s he’s going to be stuck with for the rest of his life. i would like for his name to be something that his father and i both can come to an agreement about that is reasonable! my boyfriend has now resulted to not speaking to me and has also refused to help me pick a name. his exact words were “whatever, i don’t care. i’ll just see his name on the birth certificate at the hospital”... i’m feeling really hurt by that comment because choosing a name for your first child should be something that is important to you and well thought of, not something you saw on a scratch ticket and thought would sound cool. Am i being over dramatic for not liking the name? Am i wrong for wanting my first baby’s name to be something we both love? at this point I’m feeling really pressured into letting my boyfriend name him billion just to alleviate the tension between us....