Lena's name day is observed on July 22 in Bulgaria and Greece. It is celebrated on August 18 in Sweden and the USA. Further observances include September 28 in Norway and November 10 in Poland.
The name Lena is highly regarded in the USA as a concise and enduring feminine choice, having been popular since the early 20th century. Its origins lie primarily as a short form of names like Helena, translating often to meanings of "light" or "brightness." Historically, it transitioned early from a nickname to a standalone given name in many cultures. Lena is firmly classified worldwide as a female name, valued for its classic and approachable nature. The associated mood is soft, elegant, and timeless, projecting sophisticated simplicity. This historical depth and inherent grace contribute to its continued use across generations.
| Country | Day | Month | Names |
 Bulgaria | 1 | January | Vasil, Vasilena, Vesela, Veselin, Veselina |
 USA | 12 | January | Alain, Alaina, Alan, Alana, Alanna, Alayna, Allan, Allen, Allena, Lana, Lanna |
 Czechia | 24 | January | Milena |
| Czechia | 9 | February | Apolena |
| Bulgaria | 2 | March | Milen, Milena |
 Lithuania | 2 | March | Dautara, Eitautas, Elena, Marcelinas |
 Poland | 2 | March | Absalon, Franciszek, Halszka, Helena, Henryk, Januaria, Krzysztof, Lew, Michał, Paweł, Piotr, Radosław, Symplicjusz |
| Czechia | 16 | March | Elena, Herbert |
 Latvia | 20 | March | Irbe, Made, Magda, Magdalena |
 Slovakia | 27 | March | Alena |
| Slovakia | 9 | April | Milena |
| Poland | 23 | April | Adalbert, Gerard, Gerarda, Gerhard, Helena, Jerzy, Wojciech |
| Poland | 13 | May | Andrzej, Aron, Ciechosław, Gloria, Magdalena, Piotr, Robert, Roberta, Serwacy |
 Finland | 19 | May | Emilia, Emma, Mila, Milena, Amalia, Emmi, Milja, Milka, Milla, Amelia |
 Greece | 19 | May | Menandrios, Marylena, Magdalini, Patrick, Markella |
| 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 |
 Croatia | 22 | May | Renata, Rita, Jelena, Jagoda, Milan |
| Lithuania | 22 | May | Aldona, Eimantas, Elena, Julija, Rita |
| Poland | 22 | May | Emil, Helena, Jan, Julia, Krzesisława, Rita, Wiesław, Wiesława, Wisława |
| Latvia | 24 | May | Agate, Anslavs, Estere, Ilvija, Marlena, Ziedone |
| Poland | 25 | May | Epifan, Grzegorz, Imisława, Maria Magdalena, Urban |
| USA | 25 | May | Madalyn, Madeleine, Madeline, Madelyn, Madilyn, Marlee, Marleen, Marlena, Marlene, Marley |
| Poland | 27 | May | Beda, Izydor, Jan, Juliusz, Lucjan, Magdalena, Radowit |
| Lithuania | 29 | May | Algedas, Erdvile, Magdalena, Magde |
| Poland | 29 | May | Bogusława, Maksymilian, Maria Magdalena, Teodor, Teodozja |
| Poland | 1 | June | Alfons, Alfonsyna, Bernard, Fortunat, Gracjana, Hortensjusz, Jakub, Konrad, Konrada, Magdalena, Nikodem, Świętopełk, Symeon |
| Poland | 13 | June | Antoni, Chociemir, Herman, Lucjan, Maria Magdalena, Tobiasz |
 Austria | 17 | June | Adolf, Alena, Volker |
| Poland | 27 | June | Maria Magdalena, Władysław, Władysława, Włodzisław |
| Poland | 16 | July | Andrzej, Benedykt, Dziersław, Dzierżysław, Eustachiusz, Eustachy, Faust, Maria Magdalena, Marika, Ostap, Ruta, Stefan |
| Poland | 17 | July | Aleksander, Aleksy, Andrzej, Bogdan, Dzierżykraj, Januaria, Julietta, Leon, Marceli, Marcelina, Maria Magdalena |
| Austria | 22 | July | Maria Magdalena |
| Croatia | 22 | July | Marija Magdalena |
| Czechia | 22 | July | Magdaléna |
 Germany | 22 | July | Magdalena |
 Italy | 22 | July | Maria Maddalena |
| Lithuania | 22 | July | Dalius, Magdalena, Mantile, Marija |
| Poland | 22 | July | Albin, Bolesława, Bolisława, Laurencjusz, Maria Magdalena, Milenia, Pankracy, Wawrzyniec, Więcemiła |
| Slovakia | 22 | July | Magdaléna |
 Spain | 22 | July | Teófila, Zoraida, Magdalena, Zaida, Primitiva |
 Sweden | 22 | July | Madeleine, Magdalena |
| USA | 22 | July | Amaya, Magda, Magdalen, Magdalena, Magdalene |
 Russia | 24 | July | Elena, Olga |
| Finland | 31 | July | Elena, Helena |
| Lithuania | 31 | July | Elena, Ignotas, Sanginas, Vykinte |
| Poland | 31 | July | Beatus, Demokryt, Emilian, Ernesta, Ernestyna, Helena, Iga, Ignacja, Ignacy, Justyn, Ludomir, Żegota |
| Sweden | 31 | July | Elin, Helena |
| Czechia | 13 | August | Alena |
| Poland | 13 | August | Diana, Dianna, Gertruda, Helena, Hipolit, Hipolita, Jan, Kasjan, Radomiła, Wojbor |
| Austria | 18 | August | Claudia, Helena, Rainaki |
| Croatia | 18 | August | Jelena Križarica, Bl. Manes |
| Czechia | 18 | August | Helena |
 Estonia | 18 | August | Heleene, Helene, Helena, Elina, Ilona, Helen, Hell, Hella, Helle, Hellen, Helli |
| Italy | 18 | August | Elena |
| Latvia | 18 | August | Helena, Liene |
| Poland | 18 | August | Agapit, Bogusława, Bronisław, Bronisz, Helena, Ilona, Klara, Tworzysława |
| Slovakia | 18 | August | Helena |
| Spain | 18 | August | Elena |
| USA | 21 | October | Celina, Celine, Nobel, Selena, Selina, Ursula, Wanda, Wendall, Wendell, Wendy |
| Poland | 23 | October | Iga, Ignacja, Ignacy, Jan, Marlena, Odilla, Roman, Seweryn, Teodor, Włościsław, Żegota |
 Hungary | 6 | November | Lénárd |
| Czechia | 17 | November | Mahulena |
| Sweden | 10 | December | Malena, Malin |
| USA | 16 | December | Addie, Addy, Adela, Adelaide, Adele, Adeline, Adella, Adelle, Alena, Alina, Aline, Della |
Norway