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Polish word księżyc comes from Proto-Slavic *kъnędzь (son of the prince), a poetic name by which Slavs called the Moon
*kъnędzь (Proto-Slavic)
Son of the prince. Son of the duke. Prince.
*kъnęžiťь (Proto-Slavic)
Son of the prince. Son of the duke. Prince.
księżyc (Polish)
Moon.