Eastin sits next to 3 phonetic neighbors — Austin, Easton, and Gaston are the closest matches by sound. Most share Eastin's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the east, east settlement"
"Rowan tree"
"helmet of will, resolute protector"
"mountain village; reason of the mountains (Japanese interpretation)"
"fair-haired one"
"from the Afton river"
"northerner, man from the north"
"just, righteous"
"Son of Otto"
"Beorhtsige's town"
"God has remembered"
"good, excellent + blue"
"the new house"
"fortunate, prosperous one"
"jasmine flower, protector"
"dear, beloved"
"bought land, purchased territory"
"from the broad wood"
"little branch, tender bough"
"prosperous landowner"
"one who bakes bread"
Similar sound: These names share phonetic patterns with Eastin — 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 Eastin.
Rhythm: Eastin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.