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In page Wenceslaus I, Duke of Bohemia:

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Wenceslaus is the subject of the popular Saint Stephen's Day (celebrated on December 26 in the West) carol "Good King Wenceslas". It was published by John Mason Neale in 1853, and may be a translation of a poem by Czech poet Václav Alois Svoboda[citation needed]. A supposed American spelling of the duke's name, "Wenceslaus," is occasionally encountered in later textual variants of the carol, although it was not used by Neale in his version, and in the U.S. the name usually is spelled Wenceslas, as in the carol.[1] Wenceslaus is not to be confused with King Wenceslaus I of Bohemia (Wenceslaus I Premyslid), who lived more than three centuries later.