Lav's name day is recognized in Croatia on both February 20 and November 10.
The masculine name Lav originates from Slavic languages, where its core meaning relates directly to the lion, symbolizing strength and majesty. Historically, its use in the USA has been extremely limited, appearing only marginally within specialized cultural demographics. It is a short name that carries a powerful and robust traditional tone, projecting confidence and ancient nobility. Globally, Lav is definitively classified as a male name, particularly strong in regions like the Balkans. This name conveys an elegant yet formidable personality, standing out due to its brevity and impact.
| Country | Day | Month | Names |
 Croatia | 4 | January | Sdislava |
 Slovakia | 4 | January | Drahoslav |
| Croatia | 5 | January | Emilijana, Radoslav, Miljenko |
 Bulgaria | 6 | January | Bogomil, Bogdan, Bogdana, Bozhidar, Bozhidara, Borislav, Borislava, Jordan, Yordan, Yordanka, Nayden, Teodosii |
 Russia | 6 | January | Evgenia, Klavdia |
| Croatia | 7 | January | Rajmund, Lucijan, Zorislav |
| Croatia | 10 | January | Agaton, Dobroslav, Aldo |
 Czechia | 10 | January | Břetislav |
| Czechia | 12 | January | Pravoslav |
| Slovakia | 13 | January | Rastislav |
| Slovakia | 15 | January | Dobroslav |
| Croatia | 16 | January | Marcel, Oton, Mislav |
| Croatia | 17 | January | Antun, Lavoslav, Vojmil |
| Czechia | 17 | January | Drahoslav |
| Czechia | 18 | January | Vladislav |
 Ukraine | 21 | January | Candid, Candida, Candace, Eugene, Yaroslav, Slavko |
| Czechia | 22 | January | Slavomír |
| Croatia | 24 | January | Franjo, Bogoslav |
| Croatia | 27 | January | Angela, Vitalijan, Pribislav |
| Croatia | 28 | January | Toma, Tomislav |
| Czechia | 29 | January | Zdislava |
| Croatia | 1 | February | Brigita, Gita, Miroslav |
| Croatia | 7 | February | Pio, Rikard, Držislav |
| Czechia | 12 | February | Slavěna |
| Czechia | 13 | February | Věnceslav |
 Latvia | 15 | February | Aloizs, Alvils, Olafs, Olavs, Ulafs |
| Slovakia | 15 | February | Pravoslav |
| Czechia | 17 | February | Miloslava |
| Slovakia | 17 | February | Miloslava |
| Croatia | 18 | February | Angelico, Šimun, Flavijan, Gizela |
 USA | 18 | February | Bentley, Blythe, Flavia, Flavian |
| Latvia | 2 | March | Laila, Lavize, Luize |
 Lithuania | 4 | March | Daina, Daugvydas, Kazimieras, Vaclava |
| Bulgaria | 6 | March | Krasimir, Krasimira, Bella, Miroslav, Miroslava |
| Czechia | 6 | March | Miroslav |
| Slovakia | 6 | March | Radoslav, Radoslava |
| Ukraine | 9 | March | Flavia |
| Croatia | 10 | March | Emilijan, Emil, Krunoslav |
| Slovakia | 10 | March | Branislav, Bruno |
| Croatia | 12 | March | Bernard, Budislav, Maksimilijan |
| Ukraine | 14 | March | Benedict, Rostyslav, Slavko, Vyacheslav |
| Slovakia | 16 | March | Boleslav |
| Croatia | 20 | March | Klaudija, Dionizije, Vladislav |
| Slovakia | 20 | March | Víťazoslav |
| Latvia | 21 | March | Benedikts, Boleslavs, Dzelme, Glezna, Una |
| Slovakia | 21 | March | Blahoslav |
| Slovakia | 29 | March | Miroslav |
| Slovakia | 30 | March | Vieroslava |
| Latvia | 31 | March | Atvars, Detlavs, Gvido, Staldzis |
| Russia | 1 | April | Darya, Klavdia |
| Ukraine | 2 | April | Radoslav, Rad |
| Czechia | 5 | April | Miroslava |
| Slovakia | 5 | April | Miroslava |
| Croatia | 11 | April | Stanislav, Stana, Radmila |
| Bulgaria | 12 | April | Vencislav, Vencislava, Violeta, Varban, Girgin, Girgina, Dilyan, Dilyana, Zdravka, Zdravko, Latinka, Lilyana, Margarita, Nevena, Roza, Rosen, Rosica, Trendafil, Trendafilka, Tsvetan, Tsveta, Tsvetanka, Tsviatko, Tseno, Stanislav, Stanislava |
| Ukraine | 13 | April | Yaroslava, Slavka |
| Ukraine | 15 | April | Mstyslav, Mstyslava |
| Croatia | 19 | April | Konrad, Ema, Rastislav |
| Czechia | 19 | April | Rostislav |
| Ukraine | 20 | April | Svyatoslav, Svyatoslava |
| Slovakia | 22 | April | Slavomír |
| Bulgaria | 26 | April | Toma, Tomislav, Tomislava |
| Slovakia | 26 | April | Jaroslava |
| Czechia | 27 | April | Jaroslav |
| Slovakia | 27 | April | Jaroslav |
| USA | 27 | April | Laverne, Sam, Samantha, Samara, Sami, Sammy, Samuel, Samuela, Ulises, Ulysses, Vern, Verna, Verne, Vernon, Zita |
| Czechia | 28 | April | Vlastislav |
| Czechia | 30 | April | Blahoslav |
| Bulgaria | 2 | May | Boriana, Boris, Borislav, Borislava, Boryana, Zhivko, Zhivka, Zhivodan |
| Czechia | 4 | May | Květoslav |
| Bulgaria | 5 | May | Irina, Mira, Irena, Miroslav, Miroslava |
| Ukraine | 5 | May | Myroslav, Myroslava, Irene |
| Czechia | 6 | May | Radoslav |
| Czechia | 7 | May | Stanislav |
 Denmark | 7 | May | Flavia |
 Italy | 7 | May | Flavia Domitilla |
 Spain | 7 | May | Augusto, Flavio, Gisela |
| Latvia | 8 | May | Aiga, Ceronis, Inita, Stanislavs, Stefanija |
| Latvia | 9 | May | Einars, Ervins, Klavs, Rebeka |
| Spain | 12 | May | Domingo, Nerea, Nereo, Aquileo, Flavia, Domitila |
| Latvia | 24 | May | Agate, Anslavs, Estere, Ilvija, Marlena, Ziedone |
| Latvia | 25 | May | Anitra, Anslavs, Ciemvaldis, Gunita |
| Croatia | 29 | May | Polion, Euzebije, Veceslav |
| Czechia | 5 | June | Dobroslav |
| Czechia | 7 | June | Iveta, Slavoj |
| Czechia | 9 | June | Stanislava |
| Slovakia | 9 | June | Stanislava |
| Slovakia | 11 | June | Dobroslava |
| Ukraine | 14 | June | Vladyslav |
| Bulgaria | 17 | June | Asparuh, Krum, Asen, Chavdar, Rumiana, Rumen, Momchil, Desislava |
| Slovakia | 18 | June | Vratislav, Vratislava |
| Bulgaria | 24 | June | Encho, Enyo, Yanka, Yanko, Yancho, Yanaki, Yani, Yanislav |
| Ukraine | 24 | June | Bohuslav, Bohuslava, Boris, Boryslav, Boryslava, Slavko, Slavka, Ivan, John, Yvonna, Jean, Joan, Johanna |
| Croatia | 27 | June | Ladislav kralj, Ciril Aleksandrijski |
| Czechia | 27 | June | Ladislav |
| Slovakia | 27 | June | Ladislav, Ladislava |
| Bulgaria | 29 | June | Apostol, Kamen, Pavel, Pavlin, Pavlina, Pejo, Penka, Pencho, Petrana, Petar, Petya, Petzo, Petar, Petya, Pavel, Pavlina, Polina, Kamen, Asen, Asya, Desislava, Krym, Rumen, Rumyana, Chavdar, Asen, Asya, Desislava, Krum |
| Czechia | 1 | July | Jaroslava |
| Croatia | 3 | July | Toma apostol, Tomislav, Tomo, Miki |
| Slovakia | 3 | July | Miroslav |
| Croatia | 5 | July | Ciril, Metod, Slaven |
| Czechia | 7 | July | Bohuslava |
| Czechia | 9 | July | Drahoslava |
| Croatia | 12 | July | Mislav, Tanja, Suzana |
| Croatia | 14 | July | Kamilo de Lellis, Miroslav |
| Croatia | 17 | July | Bl. Ceslav Poljak, Branko, Dunja |
| Slovakia | 17 | July | Bohuslav |
| Czechia | 21 | July | Vítězslav |
| Czechia | 27 | July | Věroslav |
 Estonia | 29 | July | Olev, Olav, Olavi, Olaf |
 Finland | 29 | July | Olavi, Olli, Uolevi, Uoti, Oula |
 Norway | 29 | July | Ola, Olav, Ole |
| Spain | 29 | July | Marta, Olavo |
| Croatia | 31 | July | Ignacije Loyolski, Vatroslav, Ognjen |
| Czechia | 8 | August | Soběslav |
| Latvia | 8 | August | Gotlibs, Mudite, Vladislavs |
| Ukraine | 10 | August | Lawrence, Lavrin |
 Greece | 18 | August | Floros, Lavros |
| Croatia | 22 | August | BD Marija Kraljica, Regina, Vladislava |
| Czechia | 22 | August | Bohuslav |
| Latvia | 24 | August | Bertolds, Bertrams, Berts, Bertulis, Boleslavs |
| Latvia | 26 | August | Bronislava, Bronislavs, Glauda, Natalija, Nate |
| Croatia | 27 | August | Monika, Honorat, Caslav |
| Croatia | 29 | August | Glavosijek Ivana Krstitelja, Sabina R. |
| Croatia | 30 | August | Feliks, Radoslava |
| Croatia | 1 | September | Egidije, Branimir, Branislav |
| Slovakia | 1 | September | Drahoslava |
| Czechia | 3 | September | Bronislav |
| Czechia | 6 | September | Boleslav |
| Croatia | 9 | September | Petar Klaver |
| Italy | 9 | September | Pietro Claver |
| Croatia | 14 | September | Uzvišenje sv. Križa, Višeslav |
| Slovakia | 20 | September | Ľuboslav, Ľuboslava |
| Ukraine | 24 | September | Rostyslava, Thekla, Thecla, Volodyslav |
| Slovakia | 25 | September | Vladislav |
| Croatia | 28 | September | Dominik, Vjenceslav |
| Czechia | 28 | September | Václav |
| Slovakia | 28 | September | Václav |
| Slovakia | 2 | October | Levoslav |
| Croatia | 5 | October | Rajmund of Capua, Flavijan, Miodrag |
| Bulgaria | 6 | October | Toma, Tomislav, Tomislava |
| Slovakia | 10 | October | Slavomíra |
| Croatia | 17 | October | Ignacije Antiohijski, Vatroslav, Ognjen |
| Croatia | 20 | October | Vendelin, Irena, Miroslava |
| Croatia | 23 | October | Ivan Kapistran, Borislav, Severin |
| Croatia | 24 | October | Antun M. Claret, Jaroslav |
| Slovakia | 24 | October | Kvetoslava |
| Croatia | 1 | November | Svetislav, Sveto |
| Bulgaria | 8 | November | Angel, Angelina, Arhangel, Gavrail, Gavril, Emil, Emilia, Emiliana, Mihaela, Mihail, Ognyan, Ognyana, Plamen, Plamena, Rada, Radka, Radko, Rafail, Raia, Raika, Raina, Rangel, Emiliya, Emiliyana, Emiliyan, Lina, Mila, Milen, Milyo, Mihaela, Mihail, Radivoy, Radoslav, Radoslava, Radostin, Radostina, Raiko, Raycho, Rangel, Rafail, Raya, Rusi |
| Croatia | 8 | November | Gracija Kotorski, Milotislav, Bogdan |
| Croatia | 13 | November | Stanislav Kostka, Brcko b., Stanko |
| Slovakia | 13 | November | Stanislav |
| Ukraine | 30 | November | Andrew, Andriy, Vladyslava |
| Czechia | 3 | December | Svatoslav |
| Bulgaria | 5 | December | Elisaveta, Sava, Savka, Svetoslav, Svetoslava, Slavi, Slavcho, Sabi, Savina, Stanislav |
| Latvia | 6 | December | Klavs, Niklavs, Nikolajs |
| Czechia | 8 | December | Květoslava |
| Czechia | 9 | December | Vratislav |
| Slovakia | 14 | December | Branislava |
| Czechia | 18 | December | Miloslav |
| Slovakia | 18 | December | Slávka |
| Ukraine | 19 | December | Boniface, Mecheslav, Mecheslava |
| Croatia | 21 | December | Honorat, Caslav, Zenon |
| Bulgaria | 25 | December | Hristina, Hristo, Kristina, Kristian, Kristiana, Emil, Itso, Icho, Mladen, Radoslav, Radoslava, Radomir, Radostin, Radostina, Hristofor |
| Croatia | 25 | December | Stjepan Prvomucenik, Krunoslav |
| Bulgaria | 27 | December | Venci, Vencislav, Vencislava, Zapryan, Sonya, Stamen, Stanimir, Stanka, Stefan, Stefana, Stefaniya, Stefka, Stoil, Stoimen, Stoichko, Stojko, Stoyan, Stoyanka, Tanya, Tsanka, Tsanko, Tsonka, Tsonyu |