Avett sits next to 3 phonetic neighbors — Everett, Emmett, and Beckett are the closest matches by sound. Most share Avett's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"modern surname-style name"
"noble, bright one"
"marshland meadow"
"God is gracious, Yahweh is gracious"
"of good appearance and strong physique"
"son of Kai/Kay (from Scandinavian -sen suffix)"
"moon, moonlight"
"foreigner, of the Welsh"
"from Luca, of the light"
"bold ruler, chief power"
"brave in war"
"sea, ocean (via Kai)"
"of Mars, god of war"
"gift of God"
"cultivator, earth worker"
"modern invented name, literary creation"
"ash tree clearing"
"modern invented name, possibly eight (from Octavian)"
"broad valley, wide hill"
"white, fair-complexioned"
"lord, prince"
Similar sound: These names share phonetic patterns with Avett — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English origins, giving them the same cultural heritage as Avett.
Rhythm: Avett is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.