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 the borough farm"
"of the sea, marine"
"of the mountain"
"peaceful will"
"American surname used as a given name"
"hare clearing"
"colt settlement; farm where young horses are kept"
"precious green stone; holder of good"
"of the sea"
"independent"
"World ruler (from Donald prefix Don-)"
"fire bearer, heat carrier"
"rock, fortress"
"farm on stony ground"
"limitless, beyond measure"
"strong and enduring as oak wood"
"warrior of the sea"
"God has taught, he who points the way"
"age, era, vast expanse of time"
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.