خواب • (xâb)
From Persian خواب (xâb).
خواب • (xvāb) m (Hindi spelling ख़्वाब)
From Middle Persian 𐭧𐭥𐭠𐭡 (xvāb), from Proto-Iranian, from Proto-Indo-Iranian, ultimately from Proto-Indo-European *swep- (“to dream”). Compare Kurdish xew, xewn.