| New calendar | Sunday, 6 December 2026 Monday, 6 December 2027 |
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| Old calendar | Saturday, 19 December 2026 Sunday, 19 December 2027 |
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| Bulgarian | Sunday, 6 December 2026 Monday, 6 December 2027 |
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| Romanian | Sunday, 6 December 2026 Monday, 6 December 2027 |
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| Albanian | Sunday, 6 December 2026 Monday, 6 December 2027 |
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Spellings and nicknames
Culae, Kola, Lae, Nae, Neculai, Nicholas, Nick, Nicky, Nico, Nicolae, Nicolas, Nicu, Niculae, Nicusor, Nicușor, Nikola, Nikolaawo, Nikolao, Nikolaos, Nikolas, Nikolasi, Nikos, Νίκος, Νικολάκης, Νικολίτσα, Νικολούδα, Νικόλαος, Колето, Кольо
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