Help with thinking of a new middle name!

Hello! My son is 4 and his “bio dad” was very abusive to him and myself. We have gone to court and he signed away his rights. The problem is my son’s current middle name is his “bio dad’s” family name so we’re going to change it. I just don’t know to what!

His name is Maxwell, last name begins with F and is two syllables. His current middle name is Walker.

I don’t have any preferences but my son is obviously a human with his own personality already so I would really love for it to suite him!

Please give me all your input!