* A name: It could be a person's name, perhaps of African origin.
* A word from another language: It might be a word from another language that doesn't have a direct English equivalent. If you could tell me what language it's from, I might be able to help translate it.
* A misspelling: It's possible it's a misspelling of another word.
To help me understand what "Omotu" means, please tell me:
* Where did you encounter this word?
* What context was it used in?
With more information, I can provide a more helpful answer!