really random, but since anakin skywalker was a slave, i really would have liked the name skywalker to be a name that he either gave himself or was given by someone else. for one, it seems odd to me that a slave would have a surname in the first place. and secondly, it seems like something that COULD have been a name he took for himself or was given. he’s a sky walker now. he’s started to travel the galaxy, fly planes and learn to be a jedi which was something that a little slave from tatooine could never even dream of. he became a skywalker when he traveled among the stars, his destiny his own to forge.
that wouldn’t have made the name any LESS valid. i would actually argue that it would have made in MORE valid. as something that truly symbolizes the period in his life between being freed and turning to the dark side.
I think we can assume that basically did happen, but with Shmi instead of Anakin.