Roni's name day is observed on September 5 in Finland.
The name Roni functions effectively in the USA primarily as a standalone, short form, exhibiting historical usage across the late 20th century. Its complex origin draws from both Hebrew sources meaning "my joy" and Germanic roots associated with "ruler's counsel." This blending of origins allows Roni to function perfectly as a truly unisex name worldwide, fluctuating between male and female use based on local culture. Roni projects an energetic and playful mood, suggesting a straightforward and quick-witted personality. It maintains its appeal due to its concise structure, avoiding overly formal or complex tones. Roni remains a strong, adaptable choice that easily bridges various cultural expectations.
| Country | Day | Month | Names |
 Hungary | 13 | January | Veronika |
 Lithuania | 13 | January | Dargaudas, Gilvyde, Iveta, Veronika |
 Poland | 13 | January | Bogumił, Bogusąd, Bogusława, Godfryd, Gotfryd, Leoncjusz, Melania, Weronika |
 Spain | 13 | January | Verónica, Gumersindo, Milagros |
 USA | 13 | January | Ivette, Veronica, Vonnie, Vonny, Yvette, Yvonne |
 Austria | 4 | February | Andreas, Rabanus, Veronika |
 Croatia | 4 | February | Katarina, Andrija, Veronika |
 Denmark | 4 | February | Veronica |
 France | 4 | February | Véronique |
 Germany | 4 | February | Veronika |
 Latvia | 4 | February | Daila, Veronika |
 Norway | 4 | February | Vera, Veronika |
| Poland | 4 | February | Andrzej, Gilbert, Jan, Joanna, Józef, Mariusz, Weronika, Witosława |
 Slovakia | 4 | February | Veronika |
| Spain | 4 | February | Gilberto, Isidro, Verónica, Juana de Valois |
 Italy | 5 | February | Gilberto Sempronio |
 Czechia | 7 | February | Veronika |
| Austria | 8 | February | Hieronimus, Josefina, Josefine |
| Croatia | 8 | February | Jeronim, Jerko |
| Spain | 8 | February | Jerónimo, Lucio, Elisanda |
 Greece | 23 | February | Polykarpos, Polychronis |
| Poland | 29 | February | Dobronieg, Roman |
| Poland | 3 | March | Asteriusz, Hieronim, Kunegunda, Lucjola, Maryna, Wierzchosława |
| Poland | 11 | March | Benedykt, Drogosława, Edwin, Kandyd, Konstanty, Konstantyn, Prokop, Rozyna, Sofroniusz |
| Poland | 24 | March | Dziersława, Dzierżysława, Gabor, Gabriel, Marek, Sewer, Sofroniusz, Szymon |
| Latvia | 8 | May | Aiga, Ceronis, Inita, Stanislavs, Stefanija |
| Greece | 17 | May | Andronikos |
| Poland | 17 | May | Bruno, Herakliusz, Paschalis, Sławomir, Torpet, Weronika, Wiktor, Wiktoriusz |
| Poland | 20 | May | Anastazy, Asteriusz, Bazyli, Bazylid, Bazylis, Bernardyn, Bernardyna, Bronimir, Iwo, Sawa, Teodor, Wiktoria |
 Sweden | 30 | May | Vera, Veronika |
| France | 31 | May | Pétronille |
| Poland | 31 | May | Aniela, Bożysława, Ernesta, Ernestyna, Feliks, Petronela, Petronia, Petroniusz, Teodor |
| Spain | 31 | May | Visitación, Petronila, Amelia, Avelina |
| Latvia | 19 | June | Nils, Vaironis, Viktors |
| Poland | 22 | June | Achacjusz, Achacy, Agenor, Alban, Broniwoj, Flawiusz, Innocenta, Innocenty, Kirył, Paulina |
| Italy | 9 | July | Veronica Giuliani |
| Lithuania | 9 | July | Algirdas, Algirde, Leonardas, Veronika |
| Poland | 9 | July | Anatolia, Heloiza, Hieronim, Łucja, Lucja, Ludwika, Lukrecja, Mikołaj, Patrycjusz, Weronika, Wszebąd, Zenon, Zenona |
| Spain | 9 | July | Milagros, Verónica |
| Greece | 12 | July | Veronica |
| Poland | 12 | July | Andrzej, Euzebiusz, Feliks, Henryk, Jan Gwalbert, Paweł, Piotr, Tolimir, Weronika |
 Ukraine | 12 | July | Hilary, Ilary, Larry, Veronica |
| Lithuania | 20 | July | Alvydas, Ceslovas, Jeronimas, Vismante |
| Poland | 20 | July | Czech, Czechasz, Czechoń, Czesław, Eliasz, Heliasz, Hieronim, Leon, Małgorzata, Paweł, Sewera |
| Greece | 30 | July | Adronikos |
 Estonia | 4 | August | Veera, Veroonika, Veronika |
| Poland | 4 | August | Alfred, Arystarch, Dominik, Maria, Mironieg, Protazy |
| Poland | 18 | August | Agapit, Bogusława, Bronisław, Bronisz, Helena, Ilona, Klara, Tworzysława |
| Latvia | 26 | August | Bronislava, Bronislavs, Glauda, Natalija, Nate |
| Poland | 26 | August | Dobroniega, Joanna, Konstanty, Maksym, Maria, Wiktorian, Zefir, Zefiryn, Zefiryna |
| Poland | 28 | August | Adelina, Aleksander, Aleksy, Augustyn, Patrycja, Sobiesław, Stronisław |
| Poland | 1 | September | Bronisław, Bronisława, Bronisz, Idzi |
| Czechia | 3 | September | Bronislav |
| Lithuania | 3 | September | Bronislova, Bronislovas, Mirga, Sirtautas |
| Poland | 3 | September | Antoni, Bartłomiej, Bazylissa, Bronisław, Bronisz, Erazma, Eufemia, Eufrozyna, Izabela, Jan, Joachim, Joachima, Manswet, Mojmir, Szymon, Wincenty, Zenon, Zenona |
| Poland | 5 | September | Dorota, Herakles, Herkulan, Herkules, Justyna, Laurencjusz, Stronisława, Wawrzyniec |
| Croatia | 30 | September | Jeronim, Jerko |
| Lithuania | 30 | September | Bytaute, Jeronimas, Sofija, Zymantas |
| Poland | 30 | September | Grzegorz, Hieronim, Honoriusz, Imisław, Leopard, Sofia, Wera, Wiera, Wiktor, Wiktoriusz, Zofia |
| Spain | 30 | September | Jerónimo |
| USA | 30 | September | Jerome, Jeronima, Gerome, Geromino |
| Poland | 6 | October | Artur, Artus, Bronisław, Bronisz, Brunon, Emil, Fryderyka, Roman |
| Greece | 7 | October | Polychronis, Sergios |
 Russia | 17 | October | Veronica |
| Poland | 19 | November | Elżbieta, Mironiega, Paweł, Seweryn, Seweryna |
| Poland | 4 | December | Barbara, Berno, Biernat, Chrystian, Hieronim, Krystian, Piotr |
Finland