Middle name for Brantley

My son is due on the 19th of next month and his father all of a sudden wants to change his middle name. I’ve chosen Brantley Allen since I was 20 or so weeks because Allen is also his dads middle name. Well now he’s super persistent about changing the middle name to Clyde because I got to choose the first name. (We aren’t together and he hasn’t been much help with any of big decisions) but now all of a sudden he’s very very involved. I just don’t know which one to do now lol because I want him to be able to help choose things but I just don’t know lol. If it helps, his last name starts with a C lol.