я не знаю никого

I don't know anyone

→ я
phrase Rare #34,011
I don't know anyone Никого means “anyone” in this negative sentence; the phrase can also mean “I know nobody.”
RU: Я не знаю никого в этом районе.
EN: I don't know anyone in this neighborhood.

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.

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.