誰か (dareka) means “someone” | MotiTan Japanese Dictionary

More examples

誰かが私を呼んでいます。dare ka ga watashi o yo n de i ma su

Someone is calling me.

駅で誰かに道を聞きました。eki de dare ka ni michi o ki ki ma shi ta

I asked someone for directions at the station.

Indicates one person without identifying who that person is.

どなたかdonataka: A polite term for an unidentified person.

人を特定せずに一人を指す語。hito o toku tei se zu ni hito ri o sa su go

Combines 誰 (dare, "who") with か (ka, "an indefinite particle"), turning a question about identity into a reference to an unspecified person.

The meaning of 誰か (dareka) depends partly on the sentence: it often means "someone" in a statement but can mean "anyone" in a question about whether a person is present.