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In page Sigismund:

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A Lithuanian name Žygimantas, meaning "wealth of (military) campaign", from Lithuanian žygis "campaign, march" + manta "goods, wealth",[1] has been a substitution of the name Sigismund in the Lithuanian language, from which[citation needed] it was adopted by the Ruthenian language as Жыгімонт (such are the cases of Sigismund Kęstutaitis, Sigismund Korybut, Sigismund I the Old, Sigismund II Augustus). The Polish spelling is Zygmunt, the Czech variant is Zikmund, and the variant used in Slovak and Serbo-Croatian is Žigmund.