[QUOTE=FarangRuMak;236209]It's most likely a short nick-name he was given as a child without reference to anything foreign or otherwise.
The boy's Cheu Linn is 'Jap' and that's all there's to it.
/QUOTE]

Today I heard from someone who spoke to the boy in question. His name is Jab which it seems is pronounced something like Jap. So you are correct FarangRuMak.