In Greek word for murder is
φόνος / phonos, and voice is
φωνή / phone. Since
Persephone is written Περσεφ
όνη and not Περσεφ
ώνη we can rule out "voice" as a possible meaning of the name. However the meaning of
Persephone is unknown and there are many alternative spellings (Persephassa / Phersephassa / Persephatta / Phersephatta etc.) that could lead to alternative etymologies.