Edvin sits next to 4 phonetic neighbors — Edwin, Edvin, and Erwin are the closest matches by sound. Most share Edvin's Old English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"wealthy friend, prosperous companion"
"magic, spell, enchantment"
"treasurer, keeper of treasure"
"God is gracious"
"beloved one"
"thunder stone"
"victory of the people (via Nicholas root)"
Similar sound: These names share phonetic patterns with Edvin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Edvin.
Rhythm: Edvin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.