Baden - A Romano-British Name?

Bath is an anglo saxon name. It comes from germanic roots, and it means bath. Romano britons didn't call the town bath. They called it aque sulis. And this was probably just a conveniently matched up identification for geoffrey of monmouth. So baden remains probably the most mysterious supposed sight connect with arthur. camelot first mentioned in connection with arthur in cretian de tois poems in the late 11 hundreds. Did he have some knowledge or information connecting arthur to this place, or did he just make it up? Maybe it was just a word he conveniently cobbled together from cam a celtic root