* It's a misspelling. There might be a similar-sounding word you're thinking of, such as "Kailan" (a type of Chinese vegetable) or "Kohinoor" (a famous diamond).
* It's a personal name. It could be a unique family name or a nickname.
* It's a regional word. It might be a local term specific to a certain area or culture.
To help me understand what you mean by "Kohilan," please provide more context:
* Where did you hear this word?
* What was the context of its use?
* What language do you think it might be from?
With more information, I can provide a more accurate answer.