I've heard of lots of variations, but I don't know of any canon ones.
In Legends, it's established that there are 5 days in a week, which were, in order:
Primeday
Centaxday
Taungsday
Zhellday
Benduday
https://starwars.fandom.com/wiki/Galactic_standard_calendar
Depending which planet you are one and how many moons the planet has. It’s different and unique on every single planet that you find in the Star Wars universe. Do you have any specific planet that you want to know about it’s weekdays?
Taken from Jedi Academy by Jeffrey Brown:
Monoday
Duoday
Triday
Quadday
Pentaday
Hexaday
Heptaday
What do you think?
