What does Kuhn mean in Thai?

Answer 1

Khun means you.

It is also used politely in front of a name, eg, Khun John, rather like Mister John.

So when Thai children shout out 'Khun, khun' to get your attention, they are being polite, shouting "Sir, sir", and not "You, you".

Answer 2

In Thai, Kuhn is a polite title used to address someone, similar to "Mr." or "Ms." in English. It is used before a person's first name or full name as a sign of respect.