How to know if a brand is copyrighted?

Is there a website or something where I can see the names that are already taken? I tried gloogling it but no luck, In my game im making up brand names I dont wanna have trouble in case I use a name already taken

It sounds like you’re referring to trademarks rather than copyrights. Researching trademarks is a complicated subject, in part because it varies country-by-country. The safest route is always to engage a specialist attorney.

If you want to search registered trademarks in the United States, you can do so here (look for the Search Trademarks button mid-page).

Yes trademarks is what I meant, English is not my first language sometimes I forget words, thank you very much that link is a lot of help