Adler sits next to 5 phonetic neighbors — Adler, Hadley, and Adele are the closest matches by sound. Most share Adler's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eagle"
"other Aenor, foreign one"
"variant of Valeria meaning strong and healthy"
"arc, curve, arch"
"place name: Zeppelinheim, Germany"
"peaceful, safe"
"stellar explosion, burst of brilliant light"
"pure, graceful"
"melted, dissolved (as in love)"
"of noble birth"
"of nova, belonging to the new star"
"slender"
"informal name for Chevrolet; associated with American car culture"
"famous warrior"
"she who weakened"
"sun, throne (Persian/Cyrus root)"
"miracle"
"lives near reed beds"
"one who knows, connoisseur"
"son of Anders (man, warrior)"
"messenger of God, angel"
Similar sound: These names share phonetic patterns with Adler — 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 Adler.
Rhythm: Adler is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.