Anu's name day is observed on July 26 in Estonia. Additionally, the name day for Anu is celebrated on December 9 in Finland.
The name Anu, short and internationally recognized, is gaining modest traction in the USA due to its simple pronunciation and global usage. Its origins are remarkably diverse, stemming both from ancient mythological figures often linked to the sky, and from a diminutive form of the classical name Anna, meaning grace. Historically, the name's brevity has ensured its longevity across changing eras and continents. Gender classification for Anu is highly regional; it is staunchly female in Scandinavia but often male in various other parts of the world, marking it as truly unisex globally. The underlying mood of Anu is sophisticated and direct, characterized by strength and simple elegance.
| Country | Day | Month | Names |
 Spain | 1 | January | Manuel, Emanuel, Jesús |
 Poland | 3 | January | Arletta, Dan, Danisz, Danuta, Enoch, Genowefa, Piotr, Włościsława |
 Estonia | 7 | January | Kanut, Nuut, Susi, Hirvo |
 USA | 7 | January | Alda, Aldea, Alden, Aldo, Aldric, Canute, Knut, Knute, Millard, Miller |
 Denmark | 9 | January | Julianus |
| Denmark | 19 | January | Pontianus |
| Poland | 19 | January | Andrzej, Bernard, Erwin, Erwina, Eufemia, Henryk, Kanut, Mariusz, Marta, Matylda, Mechtylda, Pia, Racimir, Sara |
 Austria | 20 | January | Fabianus, Sebastian, Ursula, Ute |
| Austria | 4 | February | Andreas, Rabanus, Veronika |
| Poland | 16 | February | Bernard, Dan, Danisz, Danuta, Julianna, Symeon |
| Denmark | 17 | February | Findanus |
| Poland | 2 | March | Absalon, Franciszek, Halszka, Helena, Henryk, Januaria, Krzysztof, Lew, Michał, Paweł, Piotr, Radosław, Symplicjusz |
| Denmark | 4 | March | Adrianus |
 Bulgaria | 7 | March | Bozhan, Bozhidar, Bozhidara, Bozhil, Bozhko, Emanuil, Manol, Mancho, Teodor, Teodora, Toto, Todor, Teodor, Todora, Dora, Bogdan, Bogdana |
| Spain | 25 | March | Abel, Gloria, Encarnación, Rebeca, Anunciación, Maite, Humberto |
 Croatia | 26 | March | Montan, Maksima, Emanuel |
 Czechia | 26 | March | Emanuel |
 Finland | 26 | March | Manu, Manne, Immanuel, Immo |
 Hungary | 26 | March | Emánuel |
 Italy | 26 | March | Emanuele, Teodoro |
 Latvia | 26 | March | Dabrelis, Eizenija, Emanuels, Zenija |
 Lithuania | 26 | March | Arbutas, Emanuelis, Feliksas, Tekle, Vydmante |
| Poland | 26 | March | Emanuel, Feliks, Larysa, Manuela, Nikifor, Teodor, Tworzymir |
 Slovakia | 26 | March | Emanuel |
 Sweden | 26 | March | Emanuel |
| Denmark | 8 | April | Janus |
| Latvia | 8 | April | Dana, Danute, Dziedra, Edgars, Zanete |
| Poland | 8 | April | Apolinary, Cezary, Cezaryna, Dionizy, Gawryła, January, Radosław, Sieciesława |
| Poland | 4 | May | Florian, Grzegorz, January, Michał, Monika, Paulin, Strzeżywoj |
| Lithuania | 7 | May | Butautas, Danute, Rimte, Stanislovas, Stasys |
| Denmark | 10 | May | Gordianus |
| Denmark | 25 | May | Urbanus |
| Lithuania | 25 | May | Almantas, Danute, Urbonas |
| Lithuania | 12 | June | Anupras, Dove, Kristijonas, Kristis, Ramunas |
| Latvia | 15 | June | Banuta, Benno, Vilija, Zermena |
| Denmark | 21 | June | Albanus |
| Poland | 24 | June | Dan, Danisz, Danuta, Emilia, Jan, Wilhelm |
| Poland | 10 | July | Aleksander, Amelia, Aniela, Filip, January, Radziwoj, Rufina, Samson, Sylwan, Sylwana, Witalis |
| USA | 10 | July | Emanuel, Emmanuel, Gage, Immanuel, Manuel, Manuela |
| Poland | 17 | July | Aleksander, Aleksy, Andrzej, Bogdan, Dzierżykraj, Januaria, Julietta, Leon, Marceli, Marcelina, Maria Magdalena |
| Denmark | 31 | July | Germanus |
| Poland | 6 | August | Felicysym, Jakub, January, Sława, Stefan, Sykstus, Wincenty |
| Denmark | 9 | August | Romanus |
| Austria | 13 | August | Cassian, Hippolyt, Marko, Pontianus |
| Estonia | 19 | August | Magnus, Maanus, Maano, Mango, Mauno |
| Denmark | 13 | September | Cyprianus |
| Austria | 19 | September | Igor, Januarius |
| Croatia | 19 | September | Januarije, Emilija |
| Poland | 19 | September | Alfons, Alfonsyna, January, Konstancja, Sydonia, Teodor, Więcemir |
| Poland | 1 | October | Benigna, Cieszysław, Dan, Danisz, Danuta, Igor, Jan, Remigiusz |
| Czechia | 6 | October | Hanuš |
| Spain | 10 | October | Tomás de Villanueva |
| Denmark | 20 | October | Felicianus |
| Estonia | 22 | October | Ihan, Ihanus, Jaanus, Jaano, Hannus, Hanno, Annus, Anno, Delia |
 Norway | 30 | October | Aksel, Ove, Ånund |
| Finland | 11 | November | Panu |
| Denmark | 17 | November | Anianus |
| Poland | 21 | November | Albert, Alberta, Albertyna, Janusz, Konrad, Konrada, Maria, Piotr, Regina, Rena, Rufus, Twardosław, Wiesław |
| Bulgaria | 9 | December | Ana, Anica, Anelia, Anna, Yana, Aneta, Anushka, Nusha |
 France | 25 | December | Manuel |
 Greece | 26 | December | Manolis, Manuella, Emma, Panagiotis, Emmanuel |