The name day for Erna is observed on multiple dates across different countries. These include March 2nd in both Norway and Sweden, April 14th in Austria, and July 21st in the United States. Further celebrations take place on August 29th in Hungary, September 12th in Latvia, and September 19th in Estonia.
Erna is a classically feminine name rooted in Germanic origins, functioning typically as a short form of names meaning "earnest" or "sincere." Historically, it found significant popularity in the USA during the early 20th century before usage declined, retaining a dignified vintage charm. The name’s brief structure lends itself to a mood that is described as traditional, strong, and highly pragmatic. Universally recognized as a female appellation, Erna carries a straightforward and robust tone. This concise choice embodies qualities of truthfulness and commitment derived from its ancient etymological structure.
| 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