How can we decide on the name?

My husbands family has the tradition to call all the boys by one name. Im having a boy and dont agree with that. Everyone is convinced that my son is going to be called by that name. I desagree for many reasons but he doesnt listen to me. I dont know what to do. Any name I suggest he says ahh that can be his second name. And we start fighting cause he says its tradition and I say no. And why not? Because its narcisic, unoriginal, doesnt respect babys own identity trying to pass on his family's, doesnt respect my half. And so I say ok there is still time lets discuss it some other time. By the 9th month we will still desagree. I know in my part I should respect his tradition but then im being left out. And his name doesn work well with any other cause its so biiigggg. I like it but not on his son, not on my son. Any sugestions? Any arguments that I could say in my behalf? We already have a daughter and we imediatly agreed with her name. Bahhh its been troubling me cause I want to call my baby something other than baby already though im only 16 weeks. Sorry for the bad writing im portuguese.