Mason, Jeremiah, Maddox, Justice, Michael, or Jared
Josiah, jereadiah , joemya
jayden , jahlil , jordan, jeremiah
I love the name Leo for a boy :)
I would suggest the opposite. Not a J name, but one that lets him be his own person, not a third of three. James and Jack are not that alike (because one is formal and the other is casual) but they will look like Huey, Louie and Dewey if there is third J name added to the mix.
Thanks ;) still thinking ...
Stick w the j names for the boy Jacob Jared Justin Jonah Julian
Asher
Auden
Finn
Matthew
Roman