(Pot Luck is a church Lunch gathering and everyone brings their own food to share.)
And just to emphasize that American English is really a "potluck" language: this word is derived from the Native American "Potlach" <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
hmm maybe... nethertheless there is a french expression (a bit old) who is "ŕ la fortune du pot" (so: pot luck)...
hmm origin is a bit different as it was originally meaning what was remaining in the cooking pot... but actually it means more or less that
everyone brings their own food to share
...
so actually one expression may have different origins... i don't know which is the "good" one in this case though... or if there is one...