Vann sits next to 4 phonetic neighbors — Van, Vance, and Vaughn are the closest matches by sound. Most share Vann's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"From; of the fen or marshland"
"Supplanter (from Jacob/Jakob)"
"to descend"
"invented modern name, possibly blade-valley"
"God has given"
"American variant of Dante"
"son of James, supplanter"
"man of prayer, full of goodness"
"son of the sea"
"rejoicing, celebration"
"from the rock (place surname variant)"
"from the tree stump clearing"
"spear warrior"
"noble, superior"
"old friend, wise friend"
"son of Cadán, little battle"
"from the ledge farm, shelf settlement"
"new, sky (nav element)"
"destroyer (possible etymological root)"
"precious green stone; holder of good"
"Yahweh has remembered"
Similar sound: These names share phonetic patterns with Vann — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch origins, giving them the same cultural heritage as Vann.
Rhythm: Vann is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.