There’s at least a place where Goku can name a new form “Super Saiyan 5” if he wanted to. Dragon Ball Daima takes place shortly after the events of the Majin Buu arc, but before Beerus and ...

From the time Goku first became a Super Saiyan in the Namek Saga to the arrival of the sagas such as Kaioken Form and, more recently, God Form and Ultra Instinct, each of the forms has contributed ...