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The word 'korona' is another so called world-word see e.g. 'crown' in english but who knows the original meaning?
well, it easily can be derivated from hungarian:

Residuum of the word is 'kor' as residuum of 'korong' (disk) and it signs 'kör' (circle) here.
(This way the kör (circle) residuum is basis of many hungarian words whose sign something about round shape e.g.: kerek (round), görbe (curve), karika (ring), kormány (steering-wheel), kerék (wheel), körül around, gurul (rolls). This is an ancient word can be found in latin, greek, german, hebrew and sanskrit.

Second part of the word 'ona' is not complicated now as when we study this word we have to take care we search the connection with the sun as first kings ever worn crowns were "sun-kings" of the ancient times and the crown is symbol of the Sun, our mother-star. 'ona' is from the hun-hungarian ana or anya (mother). (In tales of middle-asia often we meet Anahit as female name.)
Ana was the main godess in hungarian ancient religion of nature, she was the mother of nature or as we call Boldogasszony (Blessedwoman).

The original form of the word korona (crown) is 'kör-anya' ("circle-mother") and it signs not just the Sun but the whole universe. (Accordance to the ancient hungarian belief-world that there the Sun is really a local subunit of the cosmic forces.)

Presentment of the Boldogasszony also proves the same:

Boldogasszony of Csíksomlyó
image credit

All body of the mother shines showing star-world nature of the universe. The star-circle also enhances the cosmic meaning of Boldogasszony. On her left hand, by her heart she holds a children. Not strange she wears a 3-storey crown as 3 had central role in the ancient hun-hungarian world-view. The "one-trinity" or threeness in one signs the highest level, the eternal unit, so this way Boldogasszony is the highest level of the star-world, the universe herself.
Her son wears a simple crown so also a king but not the greatest. At the Sun-venerating scythians this child meant the Sun.
In the presentment of Boldogaszony the Sun appears as the son of the universe as we have found the same meaning in the word korona (crown).

If the solving is right, the origin of this world-word is hungarian, and if it is hungarian then the latin, greek, slav, german hebrew and sanskrit 'korona' word derives from hungarian.

source:
G.K.E./G.A.: Atilla és a Hunok (III.6., p. 91-92.)
ISBN-10: 963-8478-40-3
ISBN-13: 978-963-8478-40-5

Related by Villaman:
Holy Shrines of Great - Hungary / Csíksomlyó ( 46°18'55.07"N, 25°54'54.87"E )

wiki credits:
Holy Crown of Hungary
Doctrine of the Holy Crown