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I can't find any authoritative sources on it, but the initial consonant cluster is unusual in native Slavic words and in most cases comes as a dialectal shift from a palatalised 'd'.

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My own theory is that this name may be related to the word 'дужий' (duzhyi, "powerful, strong"), as its form in Old East Slavic was дюжь (dyuzhi).

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Source: https://en.wiktionary.org/wiki/Reconstruction:Proto-Slavic/dužь#Descendants