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In page Gyzi:

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The area was named around 1925 after famous painter Nikolaos Gyzis. By all rights, the neighbourhood should have been called Γύζη (pronounced [ˈʝi.zi]). However, due to the fact that he signed his paintings using the Latin alphabet (as he lived in Germany for a time period), this was reabsorbed into the Greek language with the current spelling and pronunciation.