completion. Iranian etymology also has historical problems. Khors could not have been borrowed during the reign of Vladimir the Great because by that time Persia had already converted to Islam, and the word Xoršid in Persian meant only "sun" and had no religious connotations. The name cannot be derived from the Avestan Hvar (because of the final -s), or hvarə хšаētəm: the expression was shortened to xwaršēδ/xoršid in Middle Persian during the Sassanid dynasty, at which time sun worship was transferred to the god Mitra. Additionally, at an early stage, iconoclasm prevailed in Persia and idols of Iranian gods were replaced with sacred fires. It is unclear, then, how the Eastern Slavs would have borrowed the word xwaršēδ/xoršid from Persia in such a short time, made a radical phonetic change, and placed Khors so high in the pantheon. Vasil'yev tried to solve this problem by suggesting the existence of a hypothetical Sarmatian-Alan word *xors/*xūrs "King-Sun" obtained through a complex chain of assumptions, but here too the phonetic problems mentioned earlier arise. A comprehensive critique of Iranian theory was also made by Andrey Beskov. Slavic etymologies From Proto-Indo-European *kr̥ḱós Aleksander Brückner (1918) also proposed a Slavic origin of the theonym. According to him, Chъrsъ in Polish would sound like chars and he finds this word in Polish dated phrases przecharsła or wycharsł meaning "emaciated, haggard, pinched, drawn" creature, or in Czech words krsati, krsnouti "to emaciate, haggard", krsek "dwarf", zakrsly, krs "dwarf shrub" with typical interchange of ch and k – the Polish word with preserved original k is karślak "knotty tree", or toponymes Karsy. The Proto-Slavic form of these words is reconstructed as the adjective *kъrsъ "declined, skinny, dwarf", the verb *kъrsati "to decrease, decline", *krsnąti "to lose weight" from PIE. *kr̥ḱós "skinny" (PIE ḱ → PS s). This interpretation was supported by Michał Łuczyński (2020). According to him, the Proto-Slavic form of theonym, *Xъrsъ, from the earlier *Kъrsъ, is formally identical with the surnames: Old Serbian Хьрсь and Old Bulgarian Xrъсъ, as well as the toponyms: Old Polish *Kars and *Chars, Serbian Hrs and Old Russian Хорсъ and others, and is derived from the adjective *kъrsъ "skinny". This reconstruction is etymologically correct, and semantically consistent with the lunar interpretation – moon as "skinny", which may have been related to lunar cycles. From Proto-Indo-European *kʷr̥s- According to the Slovak linguist Martin Pukanec (2013), the theonym Khors does not have a