Iko's name day is February 13 in Estonia.
Iko is a distinctive name that maintains a rare presence in the United States while appearing sporadically in global cultures. It is widely considered a unisex name, praised for its playful, elegant, and modern tone that feels both minimalist and memorable. The name's origins are tied to diverse linguistic roots, including Japanese and Baltic influences, which contribute to its broad appeal. Its short, three-letter structure makes it a popular choice for those who value simplicity and clarity in nomenclature. Whether viewed as a traditional link or a contemporary trend, Iko remains a versatile option for naming. The name carries a bright and energetic mood that resonates well in many different social environments.
| 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 |