Kalmar “Emperrum” suna ne da ke nufin wani nau’in ciyayi maras koren ganye, wanda akafi sani da crowberries, wadanda suka fito ne daga yankunan da ke karkashin kasa da kuma matsananciyar yanayi na yankin arewa. Kalmar ta samo asali ne daga kalmar Helenanci "empetros," ma'ana "mai wuya kamar dutse," kuma yana nufin tsayin daka da ganye.
