This is the 129th most frequent Bulgarian word.
някой
"Някой" means "someone" or "somebody" in English.
This denotes an unknown person and expresses the meaning of 'somebody'.
Някой почука на вратата.
Someone knocked on the door.
Here it refers to an indeterminate individual with a particular characteristic or ability.
Трябва ми някой, който може да помогне.
I need someone who can help.
In this sentence, 'някой' indicates an unspecified individual from a larger group.