Iko's name day is celebrated on February 13 in Estonia.
The name "Iko" is generally uncommon in the United States and worldwide, though it appears across diverse cultural contexts. Its multicultural origins suggest potential roots in both Japanese and various African languages, where it can be linked to meanings such as "child" or "covenant" depending on the specific source. The name is often considered unisex globally, though it has a slight feminine inclination in certain Asian cultures. The mood associated with "Iko" is typically modern, simple, and unique, appealing to those seeking an unconventional choice.
| Country | Day | Month | Names |
 Estonia | 9 | January | Veli, Veljo, Vello, Velvo, Veigo, Veiko, Väiko, Venda, Vendo, Venno |
| Estonia | 19 | January | Hendrik, Henrik, Henri, Heino, Henn, Henno, Enn, Enno, Eno, Heik, Heiki, Heiko, Heigo |
 Austria | 23 | January | Hartmut, Heinrich, Nikolaus |
| Estonia | 7 | February | Richard, Riho, Riko, Riku |
 Poland | 14 | February | Adolf, Adolfa, Adolfina, Alf, Cyryl, Dobiesława, Dobisława, Józef, Józefa, Konrad, Konrada, Krystyna, Lilian, Liliana, Mikołaj, Niemir, Niemira, Walenty, Zenon, Zenona |
 Bulgaria | 1 | March | Evdokiya, Marta, Martin, Martina, Boiko, Boyko |
 Greece | 3 | March | Kleonikos |
 Hungary | 10 | March | Ildikó |
| Poland | 21 | March | Benedykt, Filemon, Lubomira, Mikołaj |
| Bulgaria | 28 | March | Albena, Boyan, Boyana, Boyka, Boyko, Boiko, Boicho, Boycho |
| Bulgaria | 19 | April | Anastas, Velichka, Velika, Veliko, Velichko, Velko, Svetla, Svetozar |
| Poland | 9 | May | Beatus, Bożydar, Grzegorz, Job, Karolina, Mikołaj |
| Greece | 17 | May | Andronikos |
| Poland | 19 | May | Augustyn, Celestyn, Iwo, Mikołaj, Pękosław, Piotr, Potencjana |
 Denmark | 1 | June | Nikomedes |
 Finland | 1 | June | Teemuc, Nikodemus |
| Poland | 1 | June | Alfons, Alfonsyna, Bernard, Fortunat, Gracjana, Hortensjusz, Jakub, Konrad, Konrada, Magdalena, Nikodem, Świętopełk, Symeon |
| Poland | 2 | June | Efrem, Erazm, Eugeniusz, Marcelin, Maria, Marianna, Mikołaj, Nicefor, Piotr, Racisław |
| Poland | 9 | July | Anatolia, Heloiza, Hieronim, Łucja, Lucja, Ludwika, Lukrecja, Mikołaj, Patrycjusz, Weronika, Wszebąd, Zenon, Zenona |
| Greece | 14 | July | Nikodimos |
| Hungary | 26 | July | Anna, Anikó |
| Greece | 29 | July | Kallinikos |
| Greece | 30 | July | Adronikos |
| Bulgaria | 2 | August | Nikodim |
| Austria | 3 | August | August, Lydia, Nikodemus |
| Denmark | 3 | August | Nikodemus |
| Poland | 3 | August | August, Augusta, Krzywosąd, Lidia, Nikodem, Symeon, Szczepan |
| Estonia | 7 | August | Vaido, Vaigo, Vaiko, Hiljar, Hiljo |
 Slovakia | 29 | August | Nikolaj, Nikola |
 Croatia | 10 | September | Nikola Tolentino, Pulherija, Lijepa |
| Hungary | 10 | September | Nikolett, Hunor |
| Poland | 10 | September | Aldona, Łukasz, Mikołaj, Mścibor, Pulcheria |
| Hungary | 15 | September | Enikő, Melitta |
 Latvia | 15 | September | Gunvaldis, Nikodems, Sandra |
 Lithuania | 15 | September | Eugenija, Nikodemas, Rimgaile, Vismantas |
| Poland | 15 | September | Albin, Budzigniew, Maria, Nikodem |
| Croatia | 25 | September | Nikola of Flue, Aurelija, Kleofa, Firmin |
| Estonia | 29 | September | Miikael, Mihkel, Mikk, Miko, Miku |
| Finland | 29 | September | Mikko, Mika, Mikael, Miki, Mikaela, Miika, Miikka, Miko, Miska |
| Greece | 30 | September | Stratonikos |
| Poland | 13 | October | Daniel, Edward, Gerald, Geraldyna, Maurycy, Mikołaj, Siemisław, Teofil |
| Bulgaria | 8 | November | Angel, Angelina, Arhangel, Gavrail, Gavril, Emil, Emilia, Emiliana, Mihaela, Mihail, Ognyan, Ognyana, Plamen, Plamena, Rada, Radka, Radko, Rafail, Raia, Raika, Raina, Rangel, Emiliya, Emiliyana, Emiliyan, Lina, Mila, Milen, Milyo, Mihaela, Mihail, Radivoy, Radoslav, Radoslava, Radostin, Radostina, Raiko, Raycho, Rangel, Rafail, Raya, Rusi |
| Poland | 13 | November | Arkadiusz, Arkady, Brykcjusz, Eugeniusz, Jan, Mikołaj, Stanisław, Walentyn |
| Austria | 14 | November | Nikolaus, Sidonia |
| Croatia | 14 | November | Nikola Tavelic, Ivan Trogirski |
 Czechia | 20 | November | Nikola |
| Austria | 6 | December | Denise, Henrike, Nikolaus |
| Bulgaria | 6 | December | Nikola, Nikolai, Nina, Kolyo, Nenka, Niko, Nikolay, Nikolina, Nitza |
| Croatia | 6 | December | Nikola bikup, Nikša |
| Denmark | 6 | December | Nikolaus |
| Estonia | 6 | December | Nigulas, Nigul, Nikolai, Niilas, Niilo, Nils, Klaus, Laas, Laus |
| Finland | 6 | December | Niilo, Niko, Niki, Nikolas, Niklas, Nikolai, Niila |
| Greece | 6 | December | Nikolaos, Nicolas, Nikos, Nick, Nikoletta |
| Latvia | 6 | December | Klavs, Niklavs, Nikolajs |
 Norway | 6 | December | Nikolai, Nils |
| Poland | 6 | December | Dionizja, Emilian, Jarema, Jarogniew, Mikołaj |
 Sweden | 6 | December | Niklas, Nikolaus |
 USA | 6 | December | Claus, Ira, Nicholas, Nichole, Nick, Nicklaus, Nickolas, Nico, Nicolas, Nicole, Nicolette, Nikki, Niko, Nikolas |
| Estonia | 9 | December | Raido, Raidu, Raigo, Raiko, Raid, Raik, Rait |