Someone posted that he was from China, however.
Reflecting on the Vietnamese community hereabouts, that is entirely possible. About half of the original refugees that came after 75 and through the 80s were ethnic Chinese. While the two communities in VN didn’t like each other very much those Chinese who came here with the refugees “became” Vietnamese and were accepted as such by the Kinh (the majority Vietnamese people). And they would have redone their names in Vietnamese script.