Yes, Star Wars and pretty much everything related to it is copyright by The Lucasfilm Ltd., which is owned by Disney. While it is copyright, the odds are that they are not going to bother wasting their time and getting ROBLOX games taken down. (Although it has happened in the past with other companies.)
Yes and no, Star Wars in the past has been part of promotional events so some content is uploaded by roblox and therefor allowed to be used, therefor it becomes harder to define what you can and cant use, however in general using the term ‘Star Wars’ would be allowed since that has been included in roblox events.
If you do not have explicit permission from the copyright holder, you should not use the intellectual property.
In the case of previous promotional events, a temporary license to the specific assets were given to Roblox / games in promotion - which does not extend to every Roblox developer. This also means that they could not just use anything outside of the promotional assets within Star Wars.
If you were to use the Star Wars IP, you risk your game being taken down or your account being suspended.
Regards to OP, yes, it’s copyrighted. Regardless of if other people do it, it’s still wrong. You can abuse the fact that “other people do it,” but if you were caught outside of Roblox doing it, you’d be in trouble. Don’t use that excuse as a shield.
It would be best to replace the names. High chance you won’t get caught, but the owner’s of that property don’t want people using their stuff without permission either and since they have the law on their side, it’d be best if you did.
A promotional event gives the right to those items in particular for a specific amount of time, not the entire brand itself.
A prime example would be Adopt Me when they had that Scoob! event not too long ago. I don’t know about any of the conversations between them and the movie studio. However, Scooby and the Mystery Machine could have been permanent additions to the game, but they probably weren’t allowed the permission, so they weren’t.
The accessories and stuff branded with the Star Wars logo still exists and is usable on the platform, therefor as I said some Star Wars branding would be allowed, if you wanted to be realy safe you could rip the texture of a hat or something with the Star Wars logo and manipulate it in a way it just shows the logo.