Arabian word كَنْزٌ kanzun comes from Persian - Ganj-e Badavard (New Persian: گنچ باداورد Ganǰ-i Bādāward, literally "the treasure brought by the wind") was the name of one of the legendary eight treasures of the Sasanian king Khosrau II (r. 591-628). According to the Shahnameh, it was also the treasure of the legendary Kayanid king Kay Khosrow.
In The Quran
(11:12) So perhaps you wish to ignore some of what has been inspired to you, and you are depressed by it, because they say, "If only a treasure (Arab. كَنْزٌ, kanzun) was sent down with him, or an angel had come with him!" You are but a warner, and God is caretaker over all things.
(18:82) "As for the wall, it belonged to two orphaned boys in the city, and underneath it was a treasure (Arab. كَنْزٌ, kanzun) for them, and their father was a good man, so your Lord wanted that they would reach their maturity and take out their treasure (Arab. كَنْزَهُمَا kanzahuma) as a mercy from your Lord. None of what I did was of my own accord. That is the meaning of what you could not have patience for."
(28:76) Qarun was from among Moses' people, but he betrayed them. We gave him such treasures (Arab. الْكُنُوزِ, l-kunūzi) that the keys thereof were almost too heavy for the strongest person. His people said to him: "Do not enjoy, for God does not like hedonists."