Telegraph reporting that the accused was a member of a theatre group, and performed in a West End show :
Southport stabbings suspect performed in West End show
Sounds like the parents were trying to encourage their sons into healthy social activities, and mentions that the older brother was a lot more outgoing and that the younger took part and enjoyed the group but was not a typical theatre kid.
This situation with the name reminds me of when Huw Edwards' name was being concealed ( and look how that turned out ). As in this case, everyone in the media, politics, and of course the locals in the area know the name, but the general public are kept in the dark.
And I am sure that some of those protesting in the local area know his identity even if some of them are from outside locations. All you would have to do is ask a local villager.
Now that his family is in protection, and to stop all the fake news, the judge should release his name. The severity of the crimes and the civil unrest this is causing needs to be managed by facing up to whoever this person is and dealing with it in a rational and truthful manner. The longer they wait, the worse it is going to get and there is no way this can be kept secret much longer from all of us.