What I think may be best to do is to call out, "N Q O." When that student raises his/her hand, you ask how to pronounce his/her name. You then phonetically jot down the pronunciation of it and try your bestest to pronounce the name as most correctly as you can. At least that way, you'll show some respect to that student. Once you find out how to pronounce "Nqo," please come back and let us know. I am curious how to pronounce that too.