Okay, my coworker and I give up. We're working on something for a work Xmas party where we put Merry Christmas up in the languages where all of our department comes from (for example, I'm mostly Finnish, so we have Hyvää joulua to go up there). We've got everyone except one person and we cannot find an agreement on this one online.

So does anyone here know how you say Merry Christmas in Khmer?