Who's there?

and Who is it?

a question asking who is on the other side of a door or concealed in some other place. Hearing a noise, Tom called out in the darkness, "Who's there?" Hearing a knock on the door, Mary went to the door and said, "Who is it?"

Common Names:

Name	Pronounced	Usage
Hammer	['hæmə]
Eustathios	-	Ancient Greek
Aminah (1)	-	Arabic, Malay, Indonesian
Aparajita	-	Bengali, Indian, Hindi
Perig	-	Breton
Peggy	PEG-ee	English