The provided source material does not contain information regarding a city named Zuna in Ecuador. According to the available documentation, "Zuna" is primarily identified as a surname associated with various notable individuals, including American long-distance runner Frank Zuna, Czech journalist Pavel Zuna, and a German rapper.
Because there is no source material provided to support the existence of a city by this name in Ecuador, no further geographical or cultural details can be verified. The entry remains limited to the identification of the name as a surname.