Trust none of what you hear only some of what u saw. Leave it alone. You're likely too young to even have a name that means anything yet. So don't become the person that people can put cables on, making you react to gossip.
Go to the person who supposedly slandered you. Rather than accuse them outright, tell them you heard -whatever- was going around about you. Have they heard anything like that? If so, from whom? If they're innocent, you haven't seemed accusing; if they're guilty, you may catch them off guard.