How the hell can you have Rise of Skywalker when there's no damn Skywalker in it? Is Kylo secretly Luke's son adopted by Han and Leia or something? Because it would far stupider to have Rey be a Skywalker at this point.
Well, Kylo is technically the son of a Skywalker, Leia's adoptive surname notwithstanding. And just because Luke is dead, that doesn't mean he won't be participating in this movie.
It's end of the Skywalker line though with Luke being dead and having no children. Even if he technically has Skywalker blood, that still doesn't make him a Skywalker. There will never be another person with the last name Skywalker.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.