Erna's name day is March 2 in Norway, March 2 in Sweden, April 14 in Austria, July 21 in USA, August 29 in Hungary, September 12 in Latvia, and September 19 in Estonia.
Erna is a historically significant feminine name that was most popular in the early 20th century, particularly in Europe and the United States. Etymologically, it is linked to Germanic terms representing the eagle or a sense of seriousness. It is characterized by a strong, elegant, and grounded mood, offering a vintage and sophisticated aesthetic. While its usage has declined over time, it remains a recognized, traditional choice in regions like Germany, Scandinavia, and the Baltic countries. The name is exclusively female, maintaining a consistent gender identity throughout its history. It is a name that feels both timeless and stable, often favored for its deep cultural roots.
| Country | Day | Month | Names |
 Poland | 19 | January | Andrzej, Bernard, Erwin, Erwina, Eufemia, Henryk, Kanut, Mariusz, Marta, Matylda, Mechtylda, Pia, Racimir, Sara |
| Poland | 9 | February | Apolonia, Bernard, Cyryl, Eryk, Eryka, Gorzysław, Mariusz, Nikifor, Rajnold |
| Poland | 11 | February | Adolf, Adolfa, Adolfina, Alf, Bernadetta, Dezydery, Eufrozyna, Łazarz, Lucjan, Maria, Olgierd, Świętomira |
| Poland | 16 | February | Bernard, Dan, Danisz, Danuta, Julianna, Symeon |
 France | 18 | February | Bernadette |
 Hungary | 18 | February | Bernadett |
 Lithuania | 18 | February | Bernadeta, Gendre, Lengvenis, Simeonas |
 Croatia | 12 | March | Bernard, Budislav, Maksimilijan |
| Poland | 12 | March | Bernard, Blizbor, Grzegorz, Józefina, Wasyl |
 USA | 4 | April | Cedric, Cedrica, Plato, Tiernan, Tierney |
 Finland | 11 | April | Verna, Minea, Minka |
 Austria | 16 | April | Bernadette, Magnus |
| Croatia | 16 | April | Josip Benedikt Labre, Bernardica |
| Poland | 16 | April | Benedykt, Bernadetta, Cecyl, Cecylian, Charyzjusz, Erwin, Erwina, Julia, Ksenia, Lambert, Lamberta, Nikita, Nosisław, Patrycy, Urban |
 Spain | 16 | April | Engracia, Bernadeta |
| USA | 27 | April | Laverne, Sam, Samantha, Samara, Sami, Sammy, Samuel, Samuela, Ulises, Ulysses, Vern, Verna, Verne, Vernon, Zita |
| Croatia | 20 | May | Bernardin Sijenski |
| France | 20 | May | Bernardin |
| Hungary | 20 | May | Bernát, Felícia |
 Italy | 20 | May | Bernardino da Siena |
| Poland | 20 | May | Anastazy, Asteriusz, Bazyli, Bazylid, Bazylis, Bernardyn, Bernardyna, Bronimir, Iwo, Sawa, Teodor, Wiktoria |
 Slovakia | 20 | May | Bernard |
| USA | 20 | May | Bernadette, Bernardina, Bernardine, Bernetta, Bernita |
| Spain | 28 | May | Agustín, Bernardo, Emilio, Germán |
| Spain | 30 | May | Fernando, Estela, Fernanda, Hernán, Lorena, Hernando |
| USA | 30 | May | Joan, Joani, Joann, Joanna, Joanne, Johanna, Fawn, Fern, Fernanda, Fernando, Ferdinand, Ferdinanda, Ferdinando |
| Poland | 1 | June | Alfons, Alfonsyna, Bernard, Fortunat, Gracjana, Hortensjusz, Jakub, Konrad, Konrada, Magdalena, Nikodem, Świętopełk, Symeon |
| Spain | 11 | June | Benito, Bernabé, Aléida |
| Poland | 15 | June | Abraham, Angelina, Bernard, Jolanta, Leona, Leonida, Nikifor, Wit, Witold, Witołd, Witolda, Witosław, Wodzisław |
| France | 27 | June | Fernand |
| Poland | 10 | August | Asteria, Bernard, Bogdan, Borys, Filomena, Laurencjusz, Prochor, Wawrzyniec, Wierzchosław |
| Croatia | 20 | August | Bernard cn., Branko, Dino |
 Czechia | 20 | August | Bernard |
| France | 20 | August | Bernard, Samuel |
| Italy | 20 | August | Bernardo di Chiaravalle |
| Lithuania | 20 | August | Bernardas, Neringa, Tolvinas |
| Poland | 20 | August | Bernard, Jan, Sabin, Samuel, Samuela, Sieciech, Sobiesław, Świeciech, Szwieciech |
| Spain | 20 | August | Bernardo Abad |
| USA | 20 | August | Barnard, Bernard, Bernardo, Filbert, Philbert, Rey, Reyna, Reynalda, Reynaldo, Reynold |
| Poland | 21 | August | Adolf, Adolfa, Adolfina, Alf, Bernard, Emilian, Filipina, Franciszek, Joanna, Kazimiera, Męcimir |
| Poland | 13 | September | Aleksander, Aureliusz, Eugenia, Filip, Lubor, Materna, Morzysław, Szeliga |
| Poland | 14 | September | Bernard, Cyprian, Roksana, Siemomysł, Szymon |
| Poland | 14 | October | Alan, Bernard, Dominik, Dzierżymir, Fortunata, Kalikst, Kaliksta |
| Poland | 21 | October | Bernard, Celina, Dobromił, Elżbieta, Hilary, Klemencja, Pelagia, Pelagiusz, Urszula, Wszebora |
| Spain | 25 | October | Bernardo Calvó |
| Poland | 4 | December | Barbara, Berno, Biernat, Chrystian, Hieronim, Krystian, Piotr |
| USA | 27 | December | Adwin, Alvern, Alverna, Alvin, Alvina, Alwin, Elvin, Elvina, Elvira, Elvita, Elwin |
Norway 
Sweden 
Latvia 
Estonia