Wo
www...it's amazing to know there's few people with your same last name. I am Chiuchow too. I was born in Vietnam because my grandfather who originally from China move to Vietnam marry my grandma(Vietnam born)who is I think 1/2 chinese/vietnamese. My grandfather originate from a village in Guangdong. I think it's between Canton and 3-4 hrs away from Shenzhen. Like you, the whole village got the surname Guo or Kowk. We even have a little shrine for the Guo surname! We still have relatives living there. Probably Guo is widely distributed because it is a common surname