Namesakes
Bohemian Kings:
1 king
King Zikmund (a.k.a. Sigismund) 1419-1437 
German Kings and Holy Roman Emperors:
1 king-emperor
King-Emperor Sigismund 1410-1437
Hungarian Kings and Queens:
1 king
King Zsigmond (a.k.a. Sigismund) 1387-1437
Other Royalty:
3 princes
Sigismund of Prussia 1864-1866 Prussia
Friedrich Sigismund of Prussia 1891-1927 Prussia
Sigismund of Prussia 1896-1978 Prussia
Polish High Dukes and Kings:
3 kings
King Zygmunt I the Old (a.k.a. Sigismund) 1506-1548
King Zygmunt II Augustus (a.k.a. Sigismund) 1548-1572
King Zygmunt III Vasa (a.k.a. Sigismund) 1587-1632
Pulitzer Award Winners:
1 literature
(literature) T. S. Stribling (a.k.a. Sigismund) 1933 The Store
Saints:
1 saint
Saint Sigismund of Burgundy ?-524
Swedish Kings and Queens:
1 king
King Sigismund 1592-1599