Nishal Surname (Gotra in hindi) comes under the caste Brahmin , sub caste Jangra Brahmin. They are the descendents of Rishi Angira (Angiras (sage)). The word Jangra comes from the name of Rishi Angiras (sage) also called as Rishi Jangira.
Etymology : In hindi, Nishal means endless, which has no end, Lord Shiva,