engl. foam; the surname of the cook. Can also be Schaumlöffel = skimmer, from his tool.
There are some stories spooking in the family about a bowman fighting in the second crusade called in combat: "schau um" = look behind you, but I don't believe this. My ancestors are well documented as innkeepers from the 14th to the 17th centuries, then a younger son had to go to university. So they changed to Lutheran ministers.