Not a grammatical French phrase; it may be a mistaken attempt to say « quelqu’un est-il ? » (“is anyone…?”).
Quiconque est-il dans la pièce ?
Is anyone in the room?
Quiconque est-il absent, aujourd'hui ?
Is anyone absent today?
Is anyone here?
Is anyone surprised?
Quiconque est-il dans la maison ?
Is anyone in the house?
Is anyone in there?
Is anyone injured?
Quiconque est-il en train de regarder ?
Is anyone watching?
Is anyone already here?
Quiconque est-il à la maison ?
Is anyone home?