| Country | Day | Month | Names |
 Croatia | 29 | January | Vilana, Valerije, Konstancije |
 Italy | 30 | January | Costanzo |
 Latvia | 17 | February | Auce, Donats, Konstance |
 Poland | 17 | February | Donat, Donata, Franciszek, Izydor, Julian, Konstanty, Łukasz, Niegomir, Sylwin, Zbigniew, Zbyszko |
 Spain | 17 | February | Constanza, Rómulo, Alexis |
 Austria | 18 | February | Constanze, Simon, Simone |
| Poland | 18 | February | Albert, Alberta, Albertyna, Fryda, Konstancja, Krystiana, Maksym, Sawa, Sylwan, Sylwana, Symeon, Więcesława, Zula, Zuzanna |
| Poland | 25 | February | Bolebor, Cezary, Konstancjusz, Maciej, Małgorzata, Modest, Nicefor |
| Latvia | 11 | March | Agita, Konstantins |
 Lithuania | 11 | March | Gedimtas, Konstantinas, Vijole |
| Poland | 11 | March | Benedykt, Drogosława, Edwin, Kandyd, Konstanty, Konstantyn, Prokop, Rozyna, Sofroniusz |
 USA | 11 | March | Alberta, Albertina, Angus, Connie, Constance, Constantine, Consuela, Consuelo, Elberta, Ramiro |
| Italy | 12 | March | Costantino, Rosina |
| Austria | 11 | April | Hildebrand, Stanislaus |
| Croatia | 11 | April | Stanislav, Stana, Radmila |
 France | 11 | April | Stanislas |
| Italy | 11 | April | Stanislao |
| Spain | 11 | April | Gema, Oria, Estanislao |
 Bulgaria | 12 | April | Vencislav, Vencislava, Violeta, Varban, Girgin, Girgina, Dilyan, Dilyana, Zdravka, Zdravko, Latinka, Lilyana, Margarita, Nevena, Roza, Rosen, Rosica, Trendafil, Trendafilka, Tsvetan, Tsveta, Tsvetanka, Tsviatko, Tseno, Stanislav, Stanislava |
 Czechia | 7 | May | Stanislav |
| Lithuania | 7 | May | Butautas, Danute, Rimte, Stanislovas, Stasys |
 Denmark | 8 | May | Stanislaus |
| Latvia | 8 | May | Aiga, Ceronis, Inita, Stanislavs, Stefanija |
| Poland | 8 | May | Dezyderia, Ilza, Marek, Michał, Piotr, Stanisław |
| USA | 19 | May | Dumont, Duncan, Dunstan, Indigo, Ivar, Ives, Wright, Yves |
| Austria | 21 | May | Christoph, Constantin, Josef, Julio |
| Bulgaria | 21 | May | Elena, Konstantin, Kosta, Kostadin, Kostadinka, Lenko, Dicho, Lenko, Dinko, Elenko, Eli, Elin, Elka, Ilona, Kojcho, Kostadina, Kostadinko, Kuncho, Stamen, Stanimir, Stanimira, Stanka, Stoil, Stoyan, Stoian, Stoyanka, Trayko, Dinko |
 Estonia | 21 | May | Konstantin, Kostel, Tiino, Kindel |
 Finland | 21 | May | Konsta, Kosti, Konstantin |
| France | 21 | May | Constantin |
 Greece | 21 | May | Konstantinos, Kostas, Tina, Dina, Eleni, Helen |
 Hungary | 21 | May | Konstantin |
| Spain | 21 | May | Constantino, Virginia, Giselle, Valente |
 Sweden | 21 | May | Conny, Konstantin |
 Ukraine | 21 | May | Constantine, Constance, Helen |
| Poland | 3 | June | Cecyliusz, Ferdynand, Klotylda, Konstantyn, Laurencjusz, Laurentyn, Laurentyna, Leszek, Paula, Tamara, Wawrzyniec |
| Czechia | 9 | June | Stanislava |
 Slovakia | 9 | June | Stanislava |
| Poland | 29 | July | Beatrice, Beatrycze, Beatryks, Cierpisław, Faustyn, Konstantyn, Lucylla, Maria, Marta, Olaf, Serafina, Urban |
| Poland | 5 | August | Cyriak, Emil, Karolin, Maria, Nonna, Oswald, Oswalda, Stanisława |
| Poland | 26 | August | Dobroniega, Joanna, Konstanty, Maksym, Maria, Wiktorian, Zefir, Zefiryn, Zefiryna |
| Lithuania | 5 | September | Dingaile, Erdenis, Justina, Stanislova, Stase |
| Lithuania | 10 | September | Girminte, Konstancija, Koste, Mikalojus, Tautgirdas |
| Bulgaria | 14 | September | Krustan, Krustina, Krustyo, Krastan, Krastina, Krastyo, Kancho, Stavri, Krastyu, Krastena |
| Denmark | 19 | September | Constantia |
 Norway | 19 | September | Connie, Konstanse |
| Poland | 19 | September | Alfons, Alfonsyna, January, Konstancja, Sydonia, Teodor, Więcemir |
| Slovakia | 19 | September | Konštantín |
| Poland | 2 | October | Dionizy, Leodegar, Stanimir, Teofil, Trofim |
| Poland | 5 | October | Apolinary, Częstogniew, Donat, Donata, Faust, Fides, Flawia, Igor, Justyn, Konstancjusz, Konstans, Placyd |
| Austria | 13 | November | Eugen, Livia, Stanislaus |
| Croatia | 13 | November | Stanislav Kostka, Brcko b., Stanko |
| Poland | 13 | November | Arkadiusz, Arkady, Brykcjusz, Eugeniusz, Jan, Mikołaj, Stanisław, Walentyn |
| Slovakia | 13 | November | Stanislav |
| Poland | 30 | November | Andrzej, Justyna, Konstanty, Maura, Zbysława |
| Bulgaria | 5 | December | Elisaveta, Sava, Savka, Svetoslav, Svetoslava, Slavi, Slavcho, Sabi, Savina, Stanislav |
| USA | 22 | December | Asta, Astrid, Trista, Tristan, Tristen, Tristin, Triston |
| Bulgaria | 27 | December | Venci, Vencislav, Vencislava, Zapryan, Sonya, Stamen, Stanimir, Stanka, Stefan, Stefana, Stefaniya, Stefka, Stoil, Stoimen, Stoichko, Stojko, Stoyan, Stoyanka, Tanya, Tsanka, Tsanko, Tsonka, Tsonyu |
