is pretty apt as a signature - it is short, it is significant, it is unique, and it is in line with tradition: Rembrandt and Vincent among others used their first names.
Well, Werner Stürenburg doesn't use his first name Werner but rather his student nickname Joe which he acquired in reference to a whim of American immigrants in Paris described by » Henry Miller (» Quiet Days in Clichy). At that time, he was Joe and signed accordingly, using small letters only.