I have nothing to support this claim (not that I've been stopped by such a detail in the past), but it's my contention that Liz Lemon, producer of 'TGS with Tracy Jordan' as seen on '30 Rock' is related to Miss Lemon, the secretary for Hercule 'Poirot' back in the 1930s.
Of course, one would have to go pretty far back along the Lemon line to find exactly where the juncture is where they are connected. As such, this assertion may seem weak, based as it is on only the same last name. However, just as it can't really be defended, it can't really be shot down either.
So let's have a Lemon party!
Um... then again, maybe not......