Cognomen Nadiia (Надія 
, ناديا 
, Надия 
) , across the world, is a rare surname. The surname Nadiia is habitual in Kyrgyzstan, where it is quite a rare surname, Hungary, where it is a rare surname, and Morocco. Measured by absolute frequency, this name is the most popular in Kyrgyzstan, Indonesia, and Russia. Much more prevalently, Nadiia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Надія | Poland, Ukraine, Israel, Russia |
| ناديا | Iran, Palestinian Territory, Syria, Jordan, Iraq |
| Надия | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Nadiia | Indonesia, Morocco, Egypt, Poland, Democratic Republic of the Congo |
Nadejda, Nadeschda, Nadeshda, Nadezhda, Nadezjda, Nadeżda, Nadežda, Nadia, Nadieżda, Nadiià, Nadija, Nadiya, Nadja, Nadyezhda, Nadzeja, Nadzeya, Nadzieja, Nadíía, Nadîia, Naděžda, Naďa, Nàdiia, Nàdiià, Nàdiya, Nádiia, Nádja, Spes, Надежда, Надечка, Надзея, Надзя, Надзія, Надиа, Надииа, Надийа, Надйя, Надька, Надья, Надюша, Надя, Надєжда, Надійка, נדז'דה, נדיה, نادية, ناديجدا, نادیا, نادیہ, নাদিয়া, นาเดีย, ナディア, and 娜嘉
El, Alvarez, Bahriichuk, Boarman, Rudenko, Tantsiura, Tkachuk, Ivanova, Morozova, Salimova, Pavlenko, Dmytrenko, Gonzalez, Marchenko, Kovalchuk, Rodriguez, Lazarenko, Lukashchuk, Tkachenko, Hernandez, Vasylieva, Vasylchenko, Yarosh, Shevchenko, Flores, Garcia, Moroz, Akins, Boiko, Bilyk, Kozak, Koval, Perez, Davis, Gomez, Lipes, Lopez, Nadia, Fadda, Ortiz, ʚïɞ, Moreno, Melnyk, Suarez, Beleen, Bolkun, Piiter, Torres, and Kravchenko