Kolia
Kolia is a common diminutive form of the name Nikolai, which is of Greek origin and means "victory of the people." It is often used in Russian-speaking countries and can be a standalone name or a nickname for those named Nikolai.
In literature and film, Kolia may refer to various characters, often depicted as young boys or men. One notable example is Kolia from the film "The Russian Ark," which explores themes of history and culture in Saint Petersburg. The name carries a sense of familiarity and warmth in many cultures.