Erma's name day is April 7 in the USA.
Erma is a vintage name with Germanic origins, historically a short form of names like Ermengard. It experienced peak popularity in the early 20th century, particularly in the USA, but is now considered uncommon. The name is almost exclusively feminine, carrying a mood of quiet strength and gentle wisdom. It evokes a sense of nostalgia and classic elegance, suggesting a grounded and thoughtful personality. While not widely used globally, it has some presence in Scandinavian countries and Germany.
| Country | Day | Month | Names |
 Norway | 29 | January | Herdis, Hermann, Hermod |
 Romania | 28 | February | Gherman, Ioan, Vasile |
 Lithuania | 25 | March | Bermantas, Kantrimas, Normantas, Normante |
 Croatia | 7 | April | Ivan de la Salle, Herman, Epifan |
 Czechia | 7 | April | Heřman, Hermína |
 Hungary | 7 | April | Herman |
| Lithuania | 7 | April | Donata, Hermanas, Kantaute, Minvydas |
 Poland | 7 | April | Donat, Donata, Epifaniusz, Hegezyp, Herman, Przecław, Rufin |
 Latvia | 11 | April | Hermanis, Ira, Irida, Vilmars |
| Poland | 11 | April | Filip, Herman, Jaromir, Leon, Marek |
 Spain | 2 | May | Germán, Araceli, Atanasio, Vindemial, Exuperio, Zoé, Mafalda |
| Croatia | 9 | May | Herman, Mirna, Beato, Kristofor |
| Spain | 9 | May | Gregorio, Hermas, Geroncio |
 Ukraine | 12 | May | Herman |
 Austria | 28 | May | Germanius, Wilhelm |
| Croatia | 28 | May | German |
 France | 28 | May | Germain |
| Poland | 28 | May | Augustyn, German, Jaromir, Priam, Wiktor, Wiktoriusz, Wilhelm, Wrócimir |
| Spain | 28 | May | Agustín, Bernardo, Emilio, Germán |
| Poland | 13 | June | Antoni, Chociemir, Herman, Lucjan, Maria Magdalena, Tobiasz |
| France | 15 | June | Germaine |
 Italy | 15 | June | Germana Cousin |
 USA | 15 | June | Alice, Alicia, Alisa, Alisha, Alison, Alissa, Allie, Allison, Allyson, Alyce, Alyse, Alysha, Alysia, Alyson, Alyssa, German, Germain, Germaine, Jermaine, Vidal, Vito |
 Greece | 28 | June | Germanos |
| Spain | 7 | July | Fermín, Roberto, Odón, Germano, Peregrino |
 Estonia | 12 | July | Hermann, Herman, Armand, Hermo, Härmo, Härm, Härmel |
 Finland | 12 | July | Herkko, Hermanni, Herman |
 Sweden | 12 | July | Herman, Hermine |
| USA | 16 | July | Carmel, Carmela, Carmelo, Carmen, Shelby, Sherman, Sherwood |
| Estonia | 30 | July | Kerman, Kermo, Roland |
| Austria | 31 | July | Hermann, Ignatius, Justinus |
 Denmark | 31 | July | Germanus |
| Denmark | 11 | August | Herman |
| Poland | 11 | August | Aleksander, Herman, Ligia, Lukrecja, Włodzimierz, Włodziwoj, Zula, Zuzanna |
| Austria | 24 | September | Gerhard, Hermann, Rupert, Virgil |
| France | 25 | September | Hermann |
| Poland | 10 | October | Franciszek, German, Kalistrat, Lutomir, Paulin, Tomił |
| Lithuania | 11 | October | Daugvyde, Germanas, Rimdaugas, Zina, Zinaida |
| Poland | 11 | October | Aldona, Brunon, Burchard, Dobromiła, Emil, Emilian, Emiliusz, Germanik, Maria, Marian, Placydia |
| Croatia | 30 | October | Marcel, Marojko, Lukan, German |
| Italy | 30 | October | Germano |
| Greece | 4 | November | Ermaios |