Surname نيكولاي (Nicolae 
, Nikolay , Nikolai , along with others...) , in the entire world, is a widespread last name. The last name نيكولاي is habitual in Romania, where it is a common surname, Moldova, and Israel, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Romania, Germany, and Moldova. More prevalently, نيكولاي is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nikolay, Nicolai, Nicolae, Nikolai | Moldova, Bulgaria, Denmark, Romania, Germany |
| Nikolaj | Bulgaria, United States, Denmark, Germany, Belarus |
| Niculae | Moldova, Spain, United States, Romania, Germany |
| Nicolay | Bulgaria, United States, Denmark, Romania, Germany |
| Nickolai | Moldova, Bulgaria, United States, Denmark, Germany |
| نيكولاي | Iraq, Palestinian Territory, Yemen |
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