Nenzet Siv Vel-C was a male Tzenkethi in the 24th century.
In 2385, Nenzet was the squadron leader of a Tzenkethi Coalition squadron that searched for the USS Argus within the Helaspont Nebula. Benjamin Sisko was able to convince Nenzet to withdraw his harriers and the USS Robinson was able to escort the Argus out of the nebula. (DS9 novel: Sacraments of Fire)