This is the 3765th most frequent Spanish word.
quiénes
"Quiénes" means "who" (plural).
Used to ask about the identity of a group of people.
¿Quiénes son ellos?
Who are they?
Used to specify the individuals expected to arrive out of a group.
No sé quiénes llegarán.
I don't know who will arrive.
Used to inquire about specific members of a group that sent the package.