Namesakes
Austrian Dukes and Emperors:
1 archduke
Archduke Joseph I (middle name Eustachius) 1705-1711 
Bohemian Kings:
1 king
King Josef I (middle name Eustachius) 1705-1711
German Kings and Holy Roman Emperors:
1 king-emperor
King-Emperor Joseph I (middle name Eustachius) 1690-1711
Hungarian Kings and Queens:
1 king
King József I (middle name Eustachius) 1687-1711
Saints:
1 saint
Saint Eustace (a.k.a. Eustachius) ?-118