Jhett sits next to 4 phonetic neighbors — Jett, Jet, and Brett are the closest matches by sound. Most share Jhett's English/Old French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"jet black, black gemstone"
"fair, white, bright"
"from Leicester"
"fair, attractive"
"alder grove"
"youth, young warrior"
"ruler of supernatural beings"
"modern invented name"
"little dark one"
"the Persian"
"of the Sabine people"
"son of Evar; son of the boar"
"stubborn one"
"rock worker, craftsman"
"dear, beloved"
"the brave ones, the warriors"
"son of Rand, son of the shield-wolf"
"valley of the hares"
"God has given, gift of God"
"beauty, ornament"
"dark-haired"
Similar sound: These names share phonetic patterns with Jhett — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English/Old French origins, giving them the same cultural heritage as Jhett.
Rhythm: Jhett is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.