Family legend goes that there was a baker in Gorizia, who had 4 sons. There was not enough work for them in their father's business, so only one of them stayed in town and the other three sons moved out in nearby villages and settled there.
So there are 3 "branches" of this family still traceable in the Gorica/Gorizia surrounding towns. I really don't know, could also be that the business was closed and there were only 3 sons after all.
My earliest known ancestor was Blasius (Blaž) Susmel, who was living in the nearby Ravnica, about 5 miles from Gorica, born in 1751. He was a part of let's say, Ravnica branch, which also spread further to nearby villages. It is funny, how the priests misspelled the name at the baptisms, and it is documented, how in just few generations Susmel became Šušmelj.
(Susmel -> Sušmel -> Šušmelj)
The reason of this is a very sharp sound of this name for the local population, so they softened the spelling, I guess.
If I can help with translations, it will be my pleasure.