| Czech Republic | Mikuláš |
| Denmark | Nikolaus |
| Estonia | Klaus, Laas, Laus, Nigul, Nigulas, Niilas, Niilo, Nikolai, Nils |
| Finland | Niilo, Niklas, Niko, Nikolai |
| Finland-Swedish | Nico, Nicolas, Nicole, Nicolina, Niklas, Nils |
| France | Nicolas |
| Hungary | Miklós |
| Latvia | Niklāvs, Nikolajs, Niks |
| Lithuania | Bilmantas, Mikalojus, Norvydė |
| Norway | Nikolai, Nils |
| Poland | Emilian, Jarogniew, Mikołaj, Nicole |
| Sweden | Niklas, Nikolaus |