Vanderbilt sits next to 3 phonetic neighbors — Vanderbilt, Vandenberg, and Vandermeer are the closest matches by sound. Most share Vanderbilt's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the Bilt (a hilly area near Utrecht, Netherlands)"
"dearly beloved"
"victorious protection (via Sigmund)"
"narrow strait (base: Kyle)"
"male deer, vigorous young man"
"noble, good"
"Son of Claus (victory of the people); surname used as a given name"
"variant of Vernon: alder grove, spring-like"
"unique phonetic name"
Similar sound: These names share phonetic patterns with Vanderbilt — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch origins, giving them the same cultural heritage as Vanderbilt.
Rhythm: Vanderbilt is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.