I can find no evidence of a 7th reference:
Other incorrect counts are for Moses, God, Israelites, Caleb. But I don't understand the count from the Search e.g. Caleb in Num 13:6 = 2, which involves 5 words in ESV, 4 words in NRSV each with person:"Caleb (spy)".
From the NRSVue there are five references to Joshua:
TheseHosheason ofNunto Joshua"Nun" doesn't seem right to me, so we'll take a look at that.
From the NRSVue there are five references to Joshua: TheseHosheason ofNunto Joshua
TheseHosheason ofNunto Joshua
Very strange because I got "son of Nun" as a single match ...