Cambodian names almost always consist of two elements: surname + given name. (In the Western sometime they have some confuse between surname and given name. However, some Cambodians indicate their names with their given name before their surname. There are no middle names. Generally, women are given names of things of beauty, while men are given names of virtues. Surnames are usually taken from the surname or the given name of the father and are generally monosyllabic. For example my name is Sao Somet and my father’s name is Nen Sao. So, my surname I taken from my father’s given name, not his sure name. Cambodian people are called by their given names without a title (informal) or by their given names with a title (formal); surnames are not a usual form of address.
For Khmer Krom name, before they also done that but after taking side is the cause of conflicts and controlled of foreign countries. So, the name system depends on their culture used like Vietnamese system always consist three elements: a family name, a middle name and a given name, used in that order like Chinese system either. But after have many conquers between Vietnamese and Khmer Krom. So,