Anni's name day is observed on two separate dates depending on the country. In Estonia, the name day is celebrated on July 26th, while Finland marks the occasion on December 9th.
Anni is a charming, distinctly feminine name primarily used as a diminutive of Anna, linking its origin to the meaning of "grace" or "favor." Historically rooted in Scandinavian and Baltic naming traditions, its usage in the USA remains relatively niche compared to the more common variant, Annie. The name’s concise form gives it a bright and cheerful mood, often perceived as playful and youthful. Although not highly ranked in American popularity charts, it offers a sophisticated, soft tone for parents seeking a European flair. Worldwide, Anni is universally recognized as a name for girls.
| Country | Day | Month | Names |
 Greece | 7 | January | Ioannis, Giannis, Gianna, John, Jeannette, Ivana, Prodromos |
 Sweden | 11 | January | Jan, Jannike |
 Italy | 1 | February | Giovanni Bosco |
 USA | 1 | February | Birgit, Birgitta, Bret, Brett, Bridget, Bridgette, Brigitte, Brita, Britney, Britt, Brittani, Brittany, Brittney, Brytanni, Clark, Clarke, Langdon, Langston |
 Finland | 2 | March | Virva, Virve, Fanni, Fiona |
 Hungary | 9 | March | Franciska, Fanni |
| Italy | 9 | March | Giovanni di Dio |
 Estonia | 25 | March | Maria, Marie, Maarja, Marja, Marje, Marjo, Marju, Mari, Marili, Marika, Maari, Maarika, Manni |
| Italy | 7 | April | Giovanni Battista de la Salle |
| Finland | 12 | April | Julia, Julius, Janna, Juliaana, Janni, Juulia, Juuli |
 Norway | 21 | April | Jannike, Jeanette |
| Sweden | 21 | April | Anneli, Annika |
| Italy | 18 | May | Giovanni I |
| Greece | 27 | May | Ioannis Rossos |
| Estonia | 3 | June | Kanni, Kannike, Viola, Jolanta |
| Italy | 24 | June | Giovanni Battista (natività) |
| USA | 24 | June | Hans, Giovanna, Giovanni, Ian, Ivan, Jan, Jana, Jean, Jeanette, Jeannette, Johan, John, Johnnie, Johnny, Juan, Juana, Juanita, Sean, Shana, Shane, Shanna, Yancy |
| Finland | 12 | July | Herkko, Hermanni, Herman |
 Latvia | 26 | July | Ance, Aneta, Anna, Annija |
| USA | 26 | July | Ana, Anika, Anissa, Anita, Aniya, Aniyah, Ann, Anna, Anne, Annette, Annie, Annika, Annis, Annmarie, Anson, Anya, Blake, Hanna, Hannah, Nancy, Nanette, Nina |
 Denmark | 2 | August | Hannibal |
| Italy | 4 | August | Giovanni Maria Vianney |
| Finland | 11 | August | Sanna, Susanna, Sanni, Susanne |
| Italy | 19 | August | Giovanni Eudes |
| Italy | 29 | August | Giovanni Battista (martirio) |
| Italy | 13 | September | Giovanni Crisostomo |
| USA | 4 | October | Damara, Damaris, Berenice, Bernice, Bonita, Bonnie, Bunny, Fannie, Fanny, Frances, Francesca, Francesco, Francine, Francis, Francisco, Frank, Frankie |
| Finland | 22 | October | Anita, Anja, Anniina, Nita, Anitta, Anette |
| Italy | 23 | October | Giovanni da Capestrano |
| Italy | 4 | December | Giovanni Damasceno |
| Norway | 9 | December | Anette, Annette, Annika |
| Italy | 14 | December | Giovanni della Croce |
| Italy | 23 | December | Giovanni da Kety |
| Italy | 27 | December | Giovanni |