There is no person named נצחת (Nitzachat) mentioned in the Book of Joshua (יהושע) as an individual or character. The name נצחת does not appear in the narratives of Joshua, among his followers, family, opponents, or in any genealogical or narrative list in the sefer.

Contextual notes:

• The only prominent people mentioned directly by name in Sefer Yehoshua (Joshua) include Joshua himself, Caleb, Rahab, Achan, and the tribal leaders123.
• The search results do not mention נצחת as a person. One result (4) references the Hebrew word נצחת in a different context, quoting from Jeremiah 8 as “משובה נצחת,” which means something like “an incorrigible backsliding” or “perpetual turning away” in reference to the people of Jerusalem—it uses נצחת as an adjective, not as a personal name.
• It is possible נצחת is confused with another similarly spelled Hebrew word or name, but as of standard readings and scholarly/educational references, there is no character by that name in the book of Joshua.

If you are referring to a different book or a specific commentarial tradition, please provide further context. Based strictly on the Tanakh and major commentaries, such a person does not appear.