Summon him like make him physically appear in my trailer. We're fae enough for the summoning spell to recognize and if I had the proper elements, I could attempt to summon that skeleton even if he didn't have a name.

[ After all, Strange and Norrell managed to summon the Raven King by using three objects that would recognize the Raven King's identity despite the fact that he technically had no name. Surely the same could work for that skeleton?

And this is how Strange ends up with some of Sans's crap hanging out in trailer for the next few days. Sorry, dude. ]