i am from bosnia, bosnia was part of ex-yugoslavia. niksa is common name in these parts (bosnia, serbia, croatia), niksa = first name, or nikšić = last name, with nickname nikša or nikše.
nikša fulgozi was involved in creating come comic books in '50s, but couldn't find out much more about him. this is his imdb page
fulgosi/fulgozi sounds more italian to me, it is not surname from these parts, but if it is his real surname, his parents must be frome somewhere else, he was born in croatia though....
greatest spaghetti star from these parts of ex-yugoslavia is anthony ghidra/guidra (real name dragomir bojanić "gidra"). really great actor, one of the best.