The origin of the word polder is contested. The older theories derive polder from Dutch pol (‘sod of grass, top, head, higher piece of land’, cognate with English poll(e) and Middle-Low-German pol(le)) or from Dutch poel (‘puddle, pond of still water’; cognate with German Pfuhl, English pool and Middle-Low German pōl(e)/pūl). In this article the author will review the etymological explanations and offer new support for a connection with poel. The original meaning of polder must have been ‘a land covered in puddles, wetland, marshy ground’.