At present, there is no such website to find the number of people with the same name and surname. Even if there is, it is not accurate. Accurate data should be checked in the household registration system.

Technically, you can find out the number of people with a certain name from the information of people who have handled the second-generation ID card. For example, if all the people in the country have applied for the second-generation ID card, then your problem may be solved. Therefore, there are two key issues at present: first, they all need to apply for second-generation ID cards, and second, relevant government departments will make this information public.