Nackington is literally a hill at a wet place, from the Old English næt wet and dun hill, down, also with the suffix ing, signifying a general place. It first appears on record in the late tenth century as Natyngdun.
Nettlestead, as might be imagined, goes back to the Old English netele nettle, and just means a place where nettles grow. Its first recorded form is Netelamstyde, from the ninth century.
New Church is fairly self-explanatory. Its first appearance on the records, as Nevcerce in the Domesday Book, indicate the Old English root of cirice.
Newenden appears as Newedene in the Domesday Book. The sense is of a new woodland pasture, from the Old English denn woodland pasture and niwe new, with the dative ending an.
Kent has two Newingtons, one near Hythe and the other near Sittingbourne. Neither show up on record before the Domesday Book, the former as Neventone and the latter as Newetone. Both simply indicate a new farmstead, from the Old English tun farmstead, village.
Newnham, from Old English ham homestead, denotes a new homestead. It first appears on record as Newenham in 1177.
Noahs Ark is a fairly late name which appeared on the first Ordnance Survey map of 1819 apparently transferred from a house so called built around the turn of the eighteenth century. It may orihinally have alluded to an abundance or diversity of animals in the vicinity.
Nonington is probably literally Nunnas estate, from the Old English tun estate, farmstead. It first appears on record in around 1100 as Nunningitun.
Northbourne is literally a northern stream. It first shows up on record in 618 as Nortburne, and derives from the Old English north and burna stream.
Northfleet first shows up in the tenth century as Flyote, representing the Old English fleot stream. The affix north was added to distinguish it from Southfleet.
North Foreland is simply a promontory, from the Old English roots fore and land. It was first recorded as Forland in 1326, and South Foreland near Dover has the same origin.