Kill is a dutch word for a kind of wetlands,-marshy area, with a creek or stream.. NY is filled with them.
Dutch Kills (in Long Island city, right by 59th Street bridge) Arther Kills, Great Kill and several other kills on Staten Island, and any other number of Kill/s up and down the hudson. (i mentioned this in the thread (i think it was below the fold, on words from dutch). Like Neck, it seems to be a pretty NY geographic term-- every knows 'neck of woods' but NY has little neck, great neck, cows neck, lloyds neck, and many other place names include 'neck'-- bill bryson claims it is from an NY indian word (very similar, and i can't find it right now...in his book Made in America and it too mean a wetlands.. (and most of the necks i know are near one)