Can anybody tell me what was Seto and mokuba's surname ,befor they were adopted?

Question

In yu gi oh befor they became kaibas .

Answer 1

If you look in Wikipedia, it is stated that Seto and Mokuba's original surnames are unknown, and that they only took Gozaburo's surname after Seto won him in chess. Just if you were wondering, Seto and Mokuba were left at the orphanage due to the fact that their relatives had used up their inheritance. Irrelevant, I know, but hope it makes things clearer.