online gambling fraud?

i recieved a cheque in the post from a reputable online gambling company but the cheque was not to me it was to a person with a simalar frst name and the same second name, i notified the company and they want me to send it them back, is it possible that this cheque could have been intended for me? it came just before christmass and i thought it could have been someone betting and sending the winnings to me as a gift but getting my first name wrong otherwise how can it be fraud if the person that placed the bet never recieved the cheque?