Seppi
Seppi can be either an Italian family name, or an affectionate abbreviation for the name Joseph or Josef, commonly used in Swiss German.

Surname
Andreas Seppi (born 1984), Italian tennis player
Donato Seppi (born 1953), Italian politician

Given name
Seppi DuMoulin, Canadian Football League player of the early 20th century
Seppi Hurschler (born 1983), Swiss Nordic skiing competitor
Josef Ritler (born 1939), Swiss journalist
Jo Siffert (1936–1971), Swiss racing driver