Russian:
* Колер (Koler) - This is the most common spelling in Russian.
Other Slavic Languages:
* Колер (Koler) - This spelling is also common in other Slavic languages, such as Ukrainian, Belarusian, Bulgarian, and Serbian.
Other Languages:
* Колер (Koler) - You can also use this spelling for other languages that use the Cyrillic alphabet, such as Macedonian, Mongolian, and Kazakh.
It's always best to consult a dictionary or a native speaker of the language you are writing in to ensure you are using the correct spelling.