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.
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.
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.
Would just Yung be ok?
For me, that's only for family members and very close friends. :-)
It's like a personal nickname that you feel comfortable with if only a close circle of people use.