Talking of Mr Chong, for those of you of Chinese extraction but have very vague ideas about your surnames:
1) Mr Chong is quite common in Malaysia & Singapore
2) Most overseas Chinese in S E Asia came from southern China and were mostly Hokkien, Cantonese, Teochew, Hakka & Hainanese. The way their dialect surnames were Romanised depends on which country they settled. In Malaysia & Singapore, the clerks at the Registry of Birth were not terribly well-educated, many were non-Chinese, were not good at phonetics and there was hardly any standardisation of surnames (unlike Hong Kong).
3) Thus Chong (usually Cantonese/Hakka) is variously also spelt Choong, Chung, Cheong as well. In Hong Kong this surname is Cheung.
4) This surname in Hokkien & Teochew is usually given as Teo, Teoh or even Thio (as in Indonesia).
5) In Mandarin this used to be Chang (Koreans used Chang, Jang etc) and now in PRC's standardised Hanyu Pinyin it is Zhang.
6) The Vietnamese give this as Truong
(I'm sorry this is not he right place for this posting. I just noticed the name 'Mr Chong' claiming his surname is unique. If any Chinese Aussie with surnames like Lim, Ong, Yeo, Tan, Chua, Goh, etc is interested in finding out a little more, please initiate a new thread for this; I don't know how to do it)