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December |  Austria | Denise, Henrike, Nikolaus |  Bulgaria | Nikola, Nikolai, Nina |  Croatia | Nikica, Niko, Nikola, Nikša, Vladimir |  Czechia | Mikuláš |  Denmark | Nikolaus |  Estonia | Klaus, Laas, Laus, Nigul, Nigulas, Niilas, Niilo, Nikolai, Nils |  Finland | Niila, Niilo, Niki, Niklas, Niko, Nikolai, Nikolas |  France | Nicolas |  Greece | Nikolaos, Nikoleta, Nikos |  Hungary | Miklós |  Italy | Nicola |  Latvia | Klāvs, Niklāvs, Nikolajs |  Lithuania | Bilmantas, Mikalojus, Norvydė |  Norway | Nikolai, Nils |  Poland | Dionizja, Emilian, Jarema, Jarogniew, Mikołaj |  Romania | Nicolae |  Slovakia | Mikuláš |  Spain | Nicolás |  Sweden | Niklas, Nikolaus |
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