| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Nikolaj | - | Danish, Slovene | ||
| Nikolajs | - | Latvian | ||
| Nikolao | nee-ko-LAH-o | Esperanto | ||
| Nikolaos | - | Ancient Greek, Greek | ||
| Nikolaus | NI-ko-lows | German | ||
| Nikolay | nee-kah-LIE (Russian) | Russian, Bulgarian | ||
| Nikolche | - | Macedonian | ||
| Nikolett | - | Hungarian | ||
| Nikolina | - | Bulgarian, Croatian, Serbian, Macedonian | ||
| Nikoloz | - | Georgian | ||
| Nikomachos | - | Ancient Greek | ||
| Nikomedes | - | Ancient Greek | ||
| Nikon | - | Ancient Greek, Russian | ||
| Nikostratos | - | Ancient Greek | ||
| Nikusha | - | Georgian |