Melvin sits next to 3 phonetic neighbors — Kelvin, Elvin, and Marvin are the closest matches by sound. Most share Melvin's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"council friend"
"strength of God"
"from the fen, marshland dweller"
"strength, permanence"
"thorny shrub, prickly plant"
"Saint Anne"
"son of the right hand"
"silver"
"plow blade maker or user"
"God shall add (another son)"
"son of John"
"youthful, downy-bearded"
"descendant of Madan (little dog)"
"king of birds (folkloric)"
"lives near a bridge"
"western settlement"
"born of fire"
"ash tree settlement"
"luminous circle, sacred light"
"herb farm, meadow settlement"
"modern invented name, energetic spirit"
Similar sound: These names share phonetic patterns with Melvin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic/Old English origins, giving them the same cultural heritage as Melvin.
Rhythm: Melvin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.