The duke is known under many spellings ("Swantepolk, Swantipolk, Svatopluk, Swietopelk, Swatopolk, Sviatopolk, Światopełek, Świętopełk, Swiãtopôłk"), of which "Domin(us) Zwantepolc(us) D(ux) Danceke" and "Svantopelc Ducis Pomeranie" were used on seals.