4 April | Austria | Isidor, Konrad | Croatia | Benedikt, Izidor, Platon | Czechia | Ivana | Denmark | Ambrosius | Estonia | Ambrus, Arbo, Arp, Arpo | Finland | Ukko | France | Isidore | Hungary | Izidor | Italy | Isidoro | Latvia | Herta, Valda | Lithuania | Algaudas, Ambraziejus, Eglė, Izidorius | Norway | Nancy, Nanna, Nina | Poland | Ambroży, Bazyli, Benedykt, Izydor, Wacław, Wacława, Zdzimir | Romania | Iosif | Slovakia | Izidor | Spain | Benito | Sweden | Marianne, Marlene |
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