Dot's last name was supposed to my my og first name, but due to some reasons, my parents changed it! But I also use Soli, Zoul, and Ion as Dot's alternative last names when I'm playing games that are based in the same universe or when I'm playing multiple timelines :>
Shù's last name is because Herbst is German for Autumn.
Cran's was supposed to be a joke, y'know? 'Cran Berry'
The rest of them were mainly random