Isnenghi, very very rare, would seem typically Lombard, of Milan and Bergamo, should derive from the medieval Germanic name Iseneng, formed by the union of the terms isan (iron, steel) and engen (incalzare), with the meaning of the one who presses with the his sword.
Buy a heraldic document with your coat of arms
Verba Volant, Scripta Manent