What do you say Brampton in french?

There isn't a direct translation of "Brampton" into French. It's a proper noun, and proper nouns usually don't get translated.

You would simply say "Brampton" in French.

However, if you wanted to explain what Brampton is, you could say:

* "Brampton est une ville au Canada." (Brampton is a city in Canada.)

* "Brampton est située en Ontario." (Brampton is located in Ontario.)