Seppi DuMoulin - Canadian Football League player of the early 20thC.

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

Andreas Seppi - Italian tennis player.

Donato Seppi - Leader of Italian nationalist political party Unitalia.

Seppi Hurschler - Swiss nordic skiing competitor.

Josef Ritler - Swiss journalist.

Jo Siffert - Swiss motor racing driver of the 1960s and '70s.