Pio's name day is celebrated on February 7th in Croatia.
The name Pio stems from the Latin *Pius*, meaning "dutiful" or "pious," reflecting a deep sense of devotion. Historically popular in Southern European countries like Italy and Spain, the name is less common in the USA but carries cultural weight in specific communities. It is definitively classified as a masculine name worldwide, maintaining its traditional usage across centuries. Pio projects a mood that is serious, traditional, and authoritative, owing to its brevity and historical gravity. The name's history is closely tied to ecclesiastical figures, reinforcing its reverent tone and classic nature.
| Country | Day | Month | Names |
 Poland | 3 | January | Arletta, Dan, Danisz, Danuta, Enoch, Genowefa, Piotr, Włościsława |
| Poland | 18 | January | Bogumił, Jaropełk, Krystyna, Liberata, Małgorzata, Piotr, Pryska |
| Poland | 28 | January | Agnieszka, Augustyn, Flawian, Ildefons, Julian, Karol, Leonidas, Piotr, Radomir, Roger, Waleriusz |
| Poland | 31 | January | Cyrus, Euzebiusz, Jan, Ksawery, Ludwik, Marceli, Marcelin, Marcelina, Piotr, Spycigniew, Wirgiliusz |
| Poland | 5 | February | Adelajda, Aga, Agata, Albin, Izydor, Jakub, Jan, Justynian, Paweł, Piotr, Strzeżysława |
| Poland | 8 | February | Gniewomir, Gniewosz, Honorat, Jan, Ksenofont, Lucjusz, Paweł, Piotr, Salomon, Sebastian, Żaklina |
| Poland | 22 | February | Małgorzata, Nikifor, Piotr, Wiktor, Wiktoriusz, Wrócisław |
| Poland | 23 | February | Bądzimir, Damian, Florentyn, Łazarz, Piotr, Roma, Romana, Seweryn |
| Poland | 24 | February | Bogurad, Bogusz, Boguta, Bohusz, Lucjusz, Maciej, Piotr |
| Poland | 1 | March | Albin, Antoni, Antonina, Budzisław, Budzisz, Eudokia, Eudoksja, Ewdokia, Feliks, Herakles, Herkules, Jewdocha, Joanna, Józef, Nikifor, Piotr |
| Poland | 2 | March | Absalon, Franciszek, Halszka, Helena, Henryk, Januaria, Krzysztof, Lew, Michał, Paweł, Piotr, Radosław, Symplicjusz |
 Greece | 15 | March | Agapios |
| Poland | 23 | March | Eberhard, Feliks, Katarzyna, Kondrat, Oktawian, Pelagia, Pelagiusz, Piotr, Zbysław |
| Poland | 27 | April | Anastazy, Andrzej, Bożebor, Kanizjusz, Martyn, Piotr, Teofil, Zyta |
| Poland | 29 | April | Angelina, Augustyn, Bogusław, Hugo, Hugon, Paulin, Piotr, Rita, Robert, Roberta, Sybilla |
 Croatia | 30 | April | Pio V. papa, Josip Cottolengo |
 Italy | 30 | April | Pio V |
 Spain | 30 | April | Jaime, Amador, Pía, Pío |
| Poland | 8 | May | Dezyderia, Ilza, Marek, Michał, Piotr, Stanisław |
| Poland | 13 | May | Andrzej, Aron, Ciechosław, Gloria, Magdalena, Piotr, Robert, Roberta, Serwacy |
| Poland | 19 | May | Augustyn, Celestyn, Iwo, Mikołaj, Pękosław, Piotr, Potencjana |
| Croatia | 21 | May | Eugen, Serapion |
| Poland | 2 | June | Efrem, Erazm, Eugeniusz, Marcelin, Maria, Marianna, Mikołaj, Nicefor, Piotr, Racisław |
 Finland | 18 | June | Tapio |
| Poland | 23 | June | Agrypina, Albin, Bazyli, Józef, Piotr, Prosper, Wanda, Zenon, Zenona |
| Poland | 29 | June | Benedykta, Benita, Dalebor, Paweł, Piotr |
| Poland | 2 | July | Juda, Maria, Martynian, Otto, Piotr, Urban |
| Poland | 7 | July | Antoni, Benedykt, Cyryl, Estera, Kira, Metody, Piotr, Pompejusz, Sędzisława, Wilibald |
| Greece | 8 | July | Theofilos, Prokopios |
| Poland | 12 | July | Andrzej, Euzebiusz, Feliks, Henryk, Jan Gwalbert, Paweł, Piotr, Tolimir, Weronika |
| Poland | 1 | August | Brodzisław, Justyn, Konrad, Konrada, Nadia, Piotr |
| Poland | 12 | August | Bądzisław, Hilaria, Klara, Lech, Leonida, Piotr |
| Poland | 19 | August | Bolesław, Emilia, Jan, Julian, Juliusz, Ludwik, Piotr, Sebald |
| Croatia | 21 | August | Pio X. p., Hermogen, Anastazij |
| Italy | 21 | August | Pio X |
| Greece | 22 | August | Theoprepios |
| Poland | 9 | September | Augustyna, Aureliusz, Dionizy, Gorgoncjusz, Pimen, Piotr, Ścibor, Ścibora, Sergiusz, Sobiesąd |
| Poland | 12 | September | Amadeusz, Amedeusz, Cyrus, Gwidon, Maria, Piotr, Radzimir, Sylwin |
| Croatia | 23 | September | Padre Pio, Lino p., Tekla |
| Italy | 23 | September | Lino, Pio da Pietralcina |
| Poland | 25 | September | Aureli, Aurelia, Aurelian, Franciszek, Gaspar, Herkulan, Kamil, Kleofas, Kleopatra, Ładysław, Piotr, Rufus, Świętopełk, Wincenty, Władysław, Władysława, Włodzisław |
| Greece | 10 | October | Evlampios |
| Poland | 19 | October | Ferdynand, Fryda, Pelagia, Pelagiusz, Piotr, Siemowit, Skarbimir, Toma, Ziemowit |
| Poland | 16 | November | Aureliusz, Dionizy, Edmund, Gertruda, Leon, Marek, Maria, Niedamir, Otomar, Paweł, Piotr |
| Poland | 21 | November | Albert, Alberta, Albertyna, Janusz, Konrad, Konrada, Maria, Piotr, Regina, Rena, Rufus, Twardosław, Wiesław |
| Poland | 4 | December | Barbara, Berno, Biernat, Chrystian, Hieronim, Krystian, Piotr |
| Greece | 8 | December | Patapios |
| Poland | 25 | December | Anastazja, Eugenia, Piotr, Spirydion |