Arvin sits next to 4 phonetic neighbors — Irvin, Marvin, and Ervin are the closest matches by sound. Most share Arvin's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"friend of the army, warrior's friend"
"slender, narrow"
"mythic bird of rebirth and renewal"
"thankful, God has heard"
"Yahweh has been gracious"
"firebrand, burning torch"
"Ella's hill, Elli's hill"
"anglicization of Welsh Llwyd"
"descendant of the hound of valor"
"vigilant in war"
"Isle of Skye, Scotland"
"from Laurentum; laurel-crowned"
"dweller in the woods"
"generous, tolerant"
"atmospheric mist, haze"
"capable with a spear"
"battle, fighter"
"of love"
"modern invented American name"
"thankful"
"strength and help of God (combined from Ezra and Azariah)"
Similar sound: These names share phonetic patterns with Arvin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Arvin.
Rhythm: Arvin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.