Arnold sits next to 4 phonetic neighbors — Harold, Roland, and Donald are the closest matches by sound. Most share Arnold's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eagle power, eagle ruler"
"modest, shy"
"God is gracious"
"wealthy protector"
"sun, lord"
"cliff settlement"
"will and fame"
"from the River Irvine"
"high place, hill top"
"bird, one who flies"
"deer people (from Devon)"
"warrior, battle"
"liberator, deliverer"
"brave as a wild boar"
"of the sea, of the lake"
"firm, unwavering"
"Jehovah supports"
"protector of men"
"father of God"
"peace, peaceful"
"he who resembles God (rhetorical)"
Similar sound: These names share phonetic patterns with Arnold — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Arnold.
Rhythm: Arnold is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.