Where does “nisse” come from?

nisse (Finnish) comes from Swedish Nisse, from Swedish Nils, from Latin Nīcolāus, from Ancient Greek Νικόλαος, from Ancient Greek λᾱός, from Proto-Hellenic lāwós, from Proto-Indo-European leh₂wos, from Proto-Indo-European leh₂- — to bark, howl; to be concealed.

nisse (Finnish): Human-shaped gingerbread or other pastry