Jett sits next to 3 phonetic neighbors — Jet, Brett, and Rhett are the closest matches by sound. Most share Jett's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"black gemstone; jet"
"promised land, sanctuary"
"from the coal settlement or dark town"
"From the Scottish place name Logan; a topographic name from Gaelic ..."
"one who carries"
"one who saws wood"
"priest's town, priestly settlement"
"battle"
"whole-hearted, faithful"
"grey home, gravelly homestead"
"pledged, dedicated"
"noble, mighty of God"
"full of goodness"
"long-lived, perennial stream"
"high, elevated"
"gift of God"
"God is gracious"
"son of Jens (son of John)"
"story to be read, remarkable person"
Similar sound: These names share phonetic patterns with Jett — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Jett.
Rhythm: Jett is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.