How to clarify that supervisor writing a reference is not related to me even though we have the same last name?

By chance, one of my supervisors in which I worked on a project under shares the same last name as I do. If I ask him to write me a recommendation letter, will the admission committee misconstrue that we are related and how do I provide proof that we are not? By the way, I am Chinese, so there is perhaps more overlap in last names.