This is the 211th most frequent Hungarian word.
valaki
"Valaki" means "someone" or "somebody" in English.
Here, 'valaki' is used as a pronoun to refer to an unspecified person, the subject of the sentence.
Valaki kopogott az ajtón.
Someone knocked on the door.
In this sentence, 'valaki' is used interrogatively to suggest the possibility of an unspecified person's assistance.
Egy valaki tudna nekem segíteni?
Could anyone help me?
Here, 'valaki' is used to indicate an unspecified, but assumed to exist, kind or helpful person.