| EQUIVALENTS |
| ANCIENT GREEK: Nicolaus, Nikolaos |
| BASQUE: Nikola |
| BULGARIAN: Nikola, Nikolai, Nikolay |
| CATALAN: Nicolau |
| CROATIAN: Nikola |
| CZECH: Mikoláš, Mikula, Mikuláš, Nikola |
| DANISH: Niklas, Nikolaj |
| DUTCH: Nicolaas, Nikolaas |
| ENGLISH: Nicholas, Nickolas, Nikolas |
| ESPERANTO: Nikolao |
| ESTONIAN: Nigul |
| FINNISH: Niklas |
| FRENCH: Nicholas, Nicolas |
| GALICIAN: Nicolau |
| GEORGIAN: Nikoloz |
| GERMAN (SWISS): Niklaus |
| GERMAN: Nickolaus, Nicolaus, Niklas, Nikolaus |
| GREEK: Nicolaos, Nikolaos, Nikolas |
| HUNGARIAN: Miklós, Nikola |
| IRISH: Nioclás |
| ITALIAN: Niccolò, Nicola, Nicolò |
| LATVIAN: Nikolajs |
| MACEDONIAN: Nikola |
| MAORI: Nikora |
| MEDIEVAL ENGLISH: Nichol, Nicol |
| MEDIEVAL SLAVIC: Nikola |
| NORWEGIAN: Niklas |
| POLISH: Mikołaj |
| PORTUGUESE: Nicolau |
| ROMANIAN: Neculai, Nicolae |
| RUSSIAN: Nikolai, Nikolay |
| SCOTTISH: Neacel, Nichol, Nicol |
| SERBIAN: Nikola |
| SLOVAK: Mikuláš |
| SLOVENE: Miklavž, Nikola, Nikolaj |
| SPANISH: Nicolao, Nicolás |
| SWEDISH: Niklas |
| UKRAINIAN: Mykola |
|
| DIMINUTIVES AND SHORT FORMS |
| CROATIAN: Nikica, Niko, Nikša |
| DANISH: Cai, Caj, Claus, Kai, Kaj, Kay, Klaus, Nels, Niels, Nils |
| DUTCH: Kai, Klaas, Nick, Nico, Niek |
| ENGLISH: Colin, Collin, Nic, Nick, Nicky, Nik |
| ESPERANTO: Niĉjo |
| FINNISH: Kai, Klaus, Launo, Niilo, Niko |
| FRISIAN: Kai, Kay, Klaes |
| GEORGIAN: Nika, Nikusha |
| GERMAN: Claus, Kai, Kay, Klaus, Nico |
| GREEK: Nik |
| HUNGARIAN: Kolos, Miksa |
| ITALIAN: Nico |
| LIMBURGISH: Klaos |
| LOW GERMAN: Klaas |
| MACEDONIAN: Nikolche |
| MEDIEVAL ENGLISH: Col |
| NORWEGIAN: Cai, Caj, Kai, Kaj, Kay, Klaus, Nils |
| PORTUGUESE: Nico |
| ROMANIAN: Nicu, Nicușor |
| RUSSIAN: Kolya |
| SERBIAN: Nikica |
| SLOVENE: Nik, Niko |
| SPANISH: Nico |
| SWEDISH: Cai, Caj, Claes, Kai, Kaj, Kay, Klas, Nils |
|
| FEMININE FORMS |
| BASQUE: Nikole |
| BULGARIAN: Nikol, Nikolina |
| CROATIAN: Lina, Nika, Nikolina |
| CZECH: Nicol, Nicola, Nikol, Nikola |
| DUTCH: Klasina, Klazina, Nicol, Nicole, Nicolet, Nicoline |
| ENGLISH (BRITISH): Nichola |
| ENGLISH: Nichole, Nicky, Nicola, Nicole, Nikki, Nikkole, Nikole |
| FRENCH: Colette, Coline, Nicole, Nicolette, Nicoline |
| GERMAN: Nicol, Nicola, Nicole, Nikola |
| GREEK: Nikoleta |
| HUNGARIAN: Nikolett |
| ITALIAN: Lina, Nicoletta, Nicolina |
| MACEDONIAN: Nikolina |
| MAORI: Nikora |
| POLISH: Nikola |
| ROMANIAN: Nicoleta |
| SERBIAN: Nikolina |
| SLOVAK: Nikola |
| SLOVENE: Nika |
| SPANISH: Nicolasa |
|