Just to add some variety to the mix, you might be interested in knowing that the Susmel surname appears in Slovenia today as 'ŠUŠMELJ'. There are over 4 people with this surname in Nova Gorica (across the border from Gorizia), 2 in Logatec, 1 in Ljubljana and 1 in Komenda near Lj., to name just a few. Rather than having a German or Bohemian origin, it is quite possible that the family has Slovenian origins. If one were to check old tithe records for the Gorica/Gorizia area, it might be possible to determine how far back the surname goes in this area.