Dune sits next to 3 phonetic neighbors — June, Tune, and Moon are the closest matches by sound. Most share Dune's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sand hill, sandy mound"
"from Hesston (place name)"
"from the high place"
"descent, to descend"
"Short form of Uilliam, the Irish form of William"
"helped by God, whom God helps"
"hay valley, from the hedged valley"
"modern blend of Jay and Gavin elements"
"things to be read"
"God is witness"
"new, sky (nav element)"
"God has taught, he who points the way"
"fresh, new"
"thunder, god of thunder"
"possibly from Vashti, beautiful"
"one who speaks for God"
"the hay town"
"bearer of Christ, Christ-carrier"
Similar sound: These names share phonetic patterns with Dune — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch origins, giving them the same cultural heritage as Dune.
Rhythm: Dune is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.