The conclusion derived from the provided information is that Pat’s name day is observed on March 17th specifically within the United States.
Pat is a concise, robust name widely used in the USA as a diminutive for both Patrick and Patricia, securing its status as a highly successful unisex name. Historically, Pat gained significant traction during the mid-20th century, becoming emblematic of the American preference for familiar, shortened forms. Its Latin origin connects it to the word *patricius*, inherently meaning "nobleman" or a member of the aristocratic class. This classical background lends Pat a deep foundation, even as its modern usage projects an approachable, down-to-earth, and confident mood. While its usage is globally balanced, in the US, Pat serves primarily as a friendly nickname that cuts across gender lines. The name balances historical dignity with a strong, familiar tone.
| Country | Day | Month | Names |
 Czechia | 19 | February | Patrik |
 Norway | 5 | March | Patricia, Patrick |
 Spain | 13 | March | Patricia, Rodrigo, Ramiro |
 Italy | 14 | March | Patrizia |
 Austria | 17 | March | Gertrud, Gertraud, Patrick |
 Croatia | 17 | March | Patrik, Domagoj, Hrvatin |
 France | 17 | March | Patrice, Patrick |
 Germany | 17 | March | Patrick |
 Hungary | 17 | March | Gertrúd, Patrik |
 Lithuania | 17 | March | Gendvilas, Gertruda, Patrikas, Varuna, Vyte |
 Poland | 17 | March | Gertruda, Harasym, Jan, Patrycjusz, Patryk, Regina, Rena, Zbigniew, Zbygniew, Zbyszko |
| Spain | 17 | March | Patricio |
| Italy | 18 | March | Patrizio |
| Poland | 20 | March | Aleksander, Aleksandra, Ambroży, Anatol, Bogusław, Cyriaka, Eufemia, Klaudia, Patrycjusz, Ruprecht, Wasyl, Wincenty |
 Greece | 31 | March | Ypatios |
 Finland | 16 | April | Jalo, Patrik |
| Poland | 16 | April | Benedykt, Bernadetta, Cecyl, Cecylian, Charyzjusz, Erwin, Erwina, Julia, Ksenia, Lambert, Lamberta, Nikita, Nosisław, Patrycy, Urban |
 Sweden | 16 | April | Patricia, Patrik |
| Greece | 29 | April | Sosipatros, Jason |
 USA | 1 | May | Mae, May, Patience, Sigmund, Sigmunda |
| Greece | 19 | May | Menandrios, Marylena, Magdalini, Patrick, Markella |
| Czechia | 2 | July | Patricie |
 Slovakia | 6 | July | Patrícia, Patrik |
| Poland | 9 | July | Anatolia, Heloiza, Hieronim, Łucja, Lucja, Ludwika, Lukrecja, Mikołaj, Patrycjusz, Weronika, Wszebąd, Zenon, Zenona |
| Croatia | 11 | July | Benedikt opat, Olga, Oliver |
| Croatia | 25 | August | Ljudevit IX., Josip Kalasancijski, Patricija |
| Hungary | 25 | August | Lajos, Patrícia |
| Lithuania | 28 | August | Augustinas, Patricija, Steigvile, Tarvilas |
| Poland | 28 | August | Adelina, Aleksander, Aleksy, Augustyn, Patrycja, Sobiesław, Stronisław |
| Spain | 11 | September | Patiens |
| USA | 11 | September | Patriot Day |
| Poland | 25 | September | Aureli, Aurelia, Aurelian, Franciszek, Gaspar, Herkulan, Kamil, Kleofas, Kleopatra, Ładysław, Piotr, Rufus, Świętopełk, Wincenty, Władysław, Władysława, Włodzisław |
| Greece | 19 | October | Kleopatra, Cleo |
| Lithuania | 19 | October | Geisvilas, Kantrime, Kleopatra, Laura |
| USA | 19 | October | Cleo, Cleon, Cleopatra, Howard, Howie |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
| Croatia | 5 | December | Saba opat., Kristina, Sabina |
| Greece | 8 | December | Patapios |