There’s all sorts of possibilities to explain the lack of Smith-ing.

Skywalker could be a common enough name that it rang no bells.

Probably very few people alive knew who Darth Vader had been.

Anakin Skywalker hated Tattooine — and sand — and may have deliberately blocked out anything to do with Tattooine both…

If you want something long, and page turning, check out Worm (by Wildbow).

There’s a great Neal Stephenson piece from Wired way back in the day: