My question involves name change laws in the State of: Florida

Our son is 2 months old.
I believe that for many reasons changing our sons last name to mine would be very beneficial to him. The father is an abusive alcoholic and I would like to prove him unfit until he has sought professional help and is sober.
I have an older son from a previous marriage and we both have the same last name (my maiden, the ex didn't want to be a father and fled).
I just want to make sure the boys have the same last name as each other and me as well.
I know out of spite the father will contest this, could I at least do a hyphenated version without him agreeing??