I will make him my son, yea my first - born; who had divers privileges above other sons. (Wesley)
He shall be regarded and treated by me as the first-born son is in a family; that is, with distinguished favor and honor. (Barners)
I will deal with him as a father by his first-born son, to whom a double portion of possessions and honors belong. (Clarke)
make him great, as Jarchi interprets it; give him the blessing, the double portion of inheritance: so Christ is made most blessed for ever. (John Gill)
one who is chief, most beloved or distinguished. (JFB)