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