It's not for Malaysian born Chinese. We usually have three names. For example, mine is SOH Kam Yung:
SOH - family name
Kam - 'generational' name (same as for my brothers)
Yung - my given name
For simplicity, I usually add a hyphen (Kam-Yung) in my name to make it easier for people to refer to me in non-formal settings, i.e. I should be called "Kam Yung" or "Mr. Soh".
Calling me "Kam" (it has happened) is nonsensical from my point of view.
Same for Koreans. Capitalizing the first character of the 'generational' name and lowercase for given name could work.
But I think emphasizing the given name offers better UX so given name should be all caps and family name should be all lowercase like this: YUNG Kam soh or soh Kam YUNG.
> But I think emphasizing the given name offers better UX […]
How? You are introducing a custom capitalization convention nobody uses. People expect the UPPERCASED name, if present, to be the surname (or whatever you can sensible put after Mr/Ms). Going against strong conventions is not a good user experience.
SOH - family name
Kam - 'generational' name (same as for my brothers)
Yung - my given name
For simplicity, I usually add a hyphen (Kam-Yung) in my name to make it easier for people to refer to me in non-formal settings, i.e. I should be called "Kam Yung" or "Mr. Soh".
Calling me "Kam" (it has happened) is nonsensical from my point of view.