Rena's name day is celebrated on March 17, September 7, and November 21 in Poland, and on April 5 in Estonia.
Rena is a feminine given name with origins in Latin, often interpreted as "queen" or "ruler." It also carries associations with the Hebrew name "Renana," meaning "joyful song." In the USA, Rena typically evokes a gentle, elegant, and somewhat classic mood. The name's soft sound lends itself to a calm and thoughtful tone.
| Country | Day | Month | Names |
 Lithuania | 6 | January | Arenas, Arene, Baltazaras, Kasparas, Merkelis |
 Croatia | 22 | January | Vinko, Irena |
 USA | 24 | January | Oral, Orel, Tim, Timmy, Timon, Timothy, Vera, Verena |
 Bulgaria | 25 | January | Grigor, Grigorena |
| Lithuania | 5 | April | Irena, Rimvydas, Zenius, Zenonas, Zyginte |
 Poland | 5 | April | Borzywoj, Irena, Wincenty |
 Slovakia | 6 | April | Irena |
 Czechia | 16 | April | Irena |
| Bulgaria | 5 | May | Irina, Mira, Irena, Miroslav, Miroslava |
| Poland | 5 | May | Irena, Ita, Pius, Teodor, Waldemar, Zdzibor |
 Latvia | 13 | May | Ina, Ira, Iraida, Irena, Irene, Irina, Miervalda |
| Croatia | 22 | May | Renata, Rita, Jelena, Jagoda, Milan |
 Austria | 23 | May | Alma, Desiree, Renate |
 Spain | 30 | May | Fernando, Estela, Fernanda, Hernán, Lorena, Hernando |
 Norway | 8 | June | Renate, René |
| Austria | 28 | June | Ekkehard, Harald, Irenäus |
| Lithuania | 17 | July | Aleksas, Darius, Girenas, Vaiga |
| Latvia | 30 | July | Madara, Renars, Rosalinde, Valters |
| USA | 10 | August | Herb, Herbert, Herbie, Heriberto, Larry, Laura, Laurean, Laurel, Lauren, Laurence, Laurie, Lauryn, Lawrence, Lora, Loren, Lorena, Lorenzo, Loretta, Lori, Lorraine |
| USA | 16 | August | Craig, Kraig, Roch, Rochelle, Rochester, Rock, Rocky, Serena, Serenity, Serina |
| Austria | 1 | September | Ägidius, Ruth, Verena |
 Germany | 1 | September | Verena |
| Latvia | 1 | September | Austrums, Ilmars, Iluta, Irisa, Verena |
 Hungary | 14 | September | Szeréna, Roxána |
 France | 17 | September | Hildegarde, Lambert, Renaud |
| Croatia | 18 | September | Ivan Macias, J. Kupert., Irena |
| Poland | 18 | September | Dobrowit, Irena, Irma, Józef, Ryszarda, Stefania, Tytus, Zachariasz |
| Poland | 20 | September | Dionizy, Eustachiusz, Eustachy, Fausta, Faustyna, Filipina, Irena, Oleg, Ostap, Sozant |
| USA | 21 | September | Maira, Maura, Maureen, Mayra, Mira, Moira, Moreen, Morena, Myra, Norna |
| USA | 26 | September | Newton, Renata, Renault, Rene, Renee, Renny |
| Hungary | 6 | October | Brúnó, Renáta |
| Lithuania | 7 | October | Butrimas, Eivina, Justina, Renatas |
| Czechia | 13 | October | Renáta |
| Croatia | 20 | October | Vendelin, Irena, Miroslava |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
| Latvia | 24 | October | Ara, Modrite, Mudrite, Renate |
| USA | 29 | October | Garrison, Cyrano, Cyrena, Narcissa, Narcissus |
| Slovakia | 6 | November | Renáta |
| Croatia | 12 | November | Jozafat K., Milan, Renato |
| Hungary | 12 | November | Jónás, Renátó |
 Italy | 12 | November | Renato |
| Lithuania | 12 | November | Alvile, Asmantas, Kristinas, Renata |
| Poland | 12 | November | Cibor, Czcibor, Izaak, Jonasz, Jozafat, Konradyn, Konradyna, Krystyn, Marcin, Renat, Renata, Witold, Witołd, Witolda |
| Spain | 18 | December | Esperanza, Macarena |
Estonia