Probably connected with the Hebrew word nesher, an eagle. An Assyrian god, supposed to be that represented with the head of an eagle. Sennacherib was killed in the temple of this idol (2 Kings 19:37; Isa. 37:38).
Easton’s Bible Dictionary
Nisroch
Name meaningflight; proof; temptation; delicate
Easton’s Bible Dictionary (1897), public domain. Text via Theographic Bible Metadata, CC BY-SA 4.0.