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"
"messenger (angelos)"
"church official, rule of law"
"brook, running water"
"faith, pledge"
"son of fire"
"God's peace, divine peace"
"born at dawn"
"watchful"
"brave in power"
"from the fen, marshland dweller"
"wise protector"
"brave in battle"
"gift, wealthy possessor"
"spear, battle"
"brown, dark-complexioned"
"flat land"
"Yahweh has shown favor"
"valley, hollow"
"high mountain, exalted"
"wise friend"
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.