As an American, I would have absolutely no idea that the capital-letters name was meant to indicate the family name.

@DanielR.Collins Strange. Pretty common in Australia.

@DanielR.Collins also common use in many other countries.

I know your problem from the other side -- doing tech support for scientists which are partly from Asian countries. Some write their first- and lastname in the traditional order and others in the common English order. That causes confusion. I had once an Irish colleague whose lastname sounded rather that a firstname. The IT department created wrong user login and e-mail-address for this colleague. Therefore, I would not even trust checking th e-mail adress to find out which name is which. The answer of Steve seems to be a quite useful approach.

Is the objective to make it clear to people which if your first and last name, or just to have people refer to you by the "Mr Hong"? The latter is easier than the former, X Goodrich's answer is good for that.

Please don’t call it “first” and “last” name but “family” name and “given” name. Then you can say “my family name comes first”, which is unusual to many people, but easy to understand. And gets the right result, because people either write “Dear Mr. <family name>”, or something like “Hi, <given name>” if they are very familiar.

Using Western order can be counter-productive. My PhD supervisor, who was Japanese, did it, but because I already knew how Japanese names work and didn't realize he'd made this change, I misunderstood his name anyway.

Fascinating how there are 10 answers to this question and every single one is equally ambiguous. But I guess if you want to be 100% clear you just come across as pedantic.

@MaxD - and, according to wikipedia here you can see that each answer is correct! Or, at least, none of the answers are wrong!

@gnasher729 There are cultures where your last name is NOT your family name, but chosen or derived in a different way. The only culture independent way to fix this is an explicit "Call me X".

Why is it awkward to correct someone? If someone calls you "Mr Gildong", I don't think it's awkward to say "please call me Mr Hong - it's my surname", or "please call me Gildong - it's my given name", or even "please call me Joey".

@dbkk correct, in my culture I should be addressed by my chiefly title, neither of my names are deemed important.

@gnasher729 I agree with you fully! My first sentence was written in such confusing way to attract attention and potential answers. :)

@DawoodibnKareem Of course, correcting the other party is not entirely out of order. However, if there exists some way to help others parse my name correctly ex ante, then I could save the other party the potential embarassment they might have after I correct them. That was why I was looking for the solution(s) to this problem. :)

Sure. Let's just say that if I were the person talking to you, I would not be embarrassed by being corrected. In fact, I'd rather be corrected than be unsure - inevitably when I see a name that looks Chinese or Korean, I'm unsure which part of the name to use, so I'd welcome being corrected if I got it wrong.

@DawoodibnKareem beyond that: why is it awkward to be called by "Mr." and your given name? Names are made up and don't matter, so there is no real need to be embarrassed.