Lena's name day is observed on July 22 in Bulgaria and Greece. It is also celebrated on August 18 in Sweden and the USA. Further dates include September 28 in Norway and November 10 in Poland.
Lena is an internationally popular feminine name, particularly prevalent across Scandinavia, Eastern Europe, and the United States. Historically, it emerged as a common shortened form of longer classical names such as Helena, meaning "light," or Magdalena, meaning "tower." Its origin thus provides a rich historical context stemming from Greek and Hebrew roots. As a name, Lena carries a mood of classic elegance and gentle sophistication, perceived as both approachable and strong. It is strictly classified worldwide as a female given name.
| 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 |
 Romania | 21 | May | Constantin, Elena |
 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 |
| Romania | 22 | July | Magdalena, Maria |
| 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