Help welcome!

Soori • 22 | Married | 2 kids | Australia
Hi ladies, so you may have seen me floating around on here I don't really post much but now I'm asking for some advice! Bear with me I'll try make it as short as possible,
My husband and I have a daughter (1) and I am 15 weeks pregnant with our son. We have separated before we separated my sons name was going to be Osman Mansoor.
Osman - husbands deceased brother
Mansoor- my husbands name
Now I don't believe he deserves to be our sons middle name but he has told me that if I do not name our son 'Osman' he will have nothing to do with them or his other child so really here's my situation. Do I name my child Osman for the sake of his father or do I name them whatever I like? His whole family will also disown the children if his name isn't Osman.