Gun's name day is June 1 in Sweden.
The first name Gun is infrequently used as a standalone given name in the USA, sometimes appearing in surnames or compounds. Its potential origins tie back to Scandinavian linguistic elements often associated with strength or defense. The overall mood projected by the name is decidedly strong, direct, and minimalist in its tone. While rooted in traditions that favor a masculine designation, its rare modern usage can sometimes blur strict gender lines. It lacks a strong, widely documented history as a common given name within American culture.
| Country | Day | Month | Names |
 Estonia | 8 | January | Gunnar, Kunnar, Kunder |
 Latvia | 8 | January | Erhads, Gatis, Gundabis, Ivanda |
 Norway | 9 | January | Gunn, Gunnar |
 Sweden | 9 | January | Gunder, Gunnar |
| Norway | 19 | January | Margunn, Marius |
 Lithuania | 23 | January | Algimantasp, Gailgedas, Gunda, Raimundas |
| Lithuania | 27 | January | Ilona, Jogundas, Jogunde, Natalis, Vytenis |
 Austria | 30 | January | Adelgunde, Martina |
 Denmark | 30 | January | Adelgunde |
| Norway | 30 | January | Gunda, Gunnhild |
| Sweden | 30 | January | Gunhild, Gunilla |
| Austria | 21 | February | Enrica, Gunthild, Petrus |
| Austria | 3 | March | Friedrich, Kunigunde |
| Denmark | 3 | March | Kunigunde |
| Lithuania | 3 | March | Kunigunda, Nona, Nonita, Tule, Uosis |
| Norway | 3 | March | Gunnbjørg, Gunnveig |
 Poland | 3 | March | Asteriusz, Hieronim, Kunegunda, Lucjola, Maryna, Wierzchosława |
| Sweden | 3 | March | Gunborg, Gunvor |
| Latvia | 16 | March | Gabriels, Guntars, Guntis |
 Bulgaria | 25 | March | Blagovest, Blagovesta, Blagoi, Blaga, Blago, Blaguna, Bonka, Boncho, Marian, Mariana, Blazhe, Evangelina, Vangel, Dobri, Dobrina, Dobrinka |
| Austria | 28 | March | Guntram, Ingbert |
| Latvia | 28 | March | Eizenija, Ginta, Gunda, Gunta, Zenija |
 Spain | 28 | March | Esperanza, Gundelina |
| Spain | 29 | March | Jonas, Segundo |
| Norway | 3 | April | Gunnvald, Gunvor |
| Austria | 20 | April | Hildegund, Odetta, Wilhelm |
| Latvia | 28 | April | Gundega, Gunta, Tereze |
| Austria | 6 | May | Antonia, Britto, Gundula |
| Latvia | 25 | May | Anitra, Anslavs, Ciemvaldis, Gunita |
| Latvia | 27 | May | Dzidra, Gunita, Henrijs, Ludolfs |
| Norway | 10 | June | Ingolf, Ingunn |
| Latvia | 26 | June | Ausma, Dzejs, Inguna, Inguns, Ulvis |
| Norway | 30 | June | Solbjørg, Solgunn |
| Austria | 3 | July | Günther, Ramon, Ramona, Thomas |
| Norway | 6 | July | Torgrim, Torgunn |
| Austria | 13 | July | Arno, Heinrich, Kunigunde |
 Germany | 13 | July | Heinrich, Kunigunde |
| Poland | 24 | July | Antoni, Kinga, Krystyna, Kunegunda, Olga, Wojciecha |
| Norway | 6 | August | Gunnlaug, Gunnleiv |
| Austria | 12 | August | Karl, Radegunde |
| Lithuania | 30 | August | Adauktas, Auguna, Gaudencija, Kintenis |
| Austria | 6 | September | Bertram, Gundolf, Magnus |
| Latvia | 15 | September | Gunvaldis, Nikodems, Sandra |
| Norway | 17 | September | Hildebjørg, Hildegunn |
| Latvia | 20 | September | Guntra, Marianna |
| Latvia | 26 | September | Egmonts, Gundars, Knuts, Kurts |
| Austria | 8 | October | Felix, Günther, Simeon |
| Austria | 9 | October | Dionys, Günter, Sara, Johannes |
| Germany | 9 | October | Günter |
 USA | 9 | October | Denice, Denis, Denise, Dennis, Denny, Dion, Gunnar, Gunther, Leif |
| Austria | 28 | November | Berta, Gunther, Jakob |
| Latvia | 8 | December | Guna, Gunars, Marieta, Vladimirs |
| Lithuania | 8 | December | Gedminte, Guntilda, Vaidginas, Zenonas |
| Latvia | 10 | December | Cera, Guna, Judite, Sniedze |