[X] Ask him what he wants.
-[X] Make sure he knows both the benefits and drawbacks to keeping his name or changing it, and the possibility of future ruling opportunities either way.
[X]forming a cadet house (leave the name up to Jon)
-[X] the house will be given an island to govern in the Stepstones that way the house will have independence to considered legitimate but stay close enough that no shenanigans like Damon the rogue prince or the BlackFires could happen latter down the line
--[X] if Jon doesn't want a domain to rule he could be given a large plot of developed land and a mansion in the city to become his estate instated