Austen sits next to 4 phonetic neighbors — Austin, Aspen, and Easton are the closest matches by sound. Most share Austen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great, magnificent"
"magical, illusory beauty"
"the heavens, sky and sea"
"dark one"
"mountain range, saw-toothed peaks"
"priceless, praiseworthy"
"new, modern"
"dove"
"manly, strong"
"noble strength"
"heavenly, royal, of the sky"
"of noble birth"
"pleasantness, sweetness"
"jewel, ornament"
"beautiful and honest"
"like a bird"
"feminine form of Carl/Charles"
"measured motion, proportion"
Similar sound: These names share phonetic patterns with Austen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Austen.
Rhythm: Austen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.