я не знаю никого

I don't know anyone

→ я
phrase Rare #28,477
I don't know anyone Used to say that you do not know any person. Никого is the genitive form of кто under negation; depending on context, it can also be translated as “nobody.”
RU: Я не знаю никого в этом городе.
EN: I don't know anyone in this city.

Я не знаю никого с таким именем.

I don’t know anyone by that name.

Я не знаю никого, кому бы нравился Том.

I don't know anyone who likes Tom.

Я не знаю никого по имени.

I don't know anyone by name.

Я не знаю никого умнее Тома.

I don't know anyone smarter than Tom.