If you assume, that the CH was omitted, SMARR (Schmarr) may be a German surname. It's not in my books and I have never heard of it. There is the German vocabulary word "Schmarre" or "Schmarren" or "Schmarrn" with several meanings: a Bavarian dish made from flour / a blow or stroke / a lump. The latter would make sense as a surname: a fat and lumpy person. But this is no more than a guess.