If you are having trouble on what is considered a "Rare" name; this pinned thread may help you out. Typically 1 word names with a suffix: "ed, ing, s" are practically worth nothing. The shorter the name the better. However, this doesn't mean you won't sell the names, it just means you might have to accept offers for substantially less than what you're asking. Good luck with your sale though!
How To Tell if your Name is Rare or Not + Name Market Tips/FAQ