Oswin sits next to 4 phonetic neighbors — Oswald, Osborne, and Edwin are the closest matches by sound. Most share Oswin's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God's friend, divine companion"
"ruler of the world"
"from the court"
"resembling God"
"from Sebastos (venerable city)"
"rocky settlement"
"little king"
"my covering is God; God protects"
"respect, governance"
"descendant of fire, young warrior"
"modern surname-style name"
"shining, bright"
"right-handed, skillful"
"brave in battle (via Casey etymology)"
"cultivator, earth worker"
"from the rocky hill, crag dweller"
"child born at a prosperous time"
"crafty, wily"
"beloved, praised"
"new house"
Similar sound: These names share phonetic patterns with Oswin — 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 Oswin.
Rhythm: Oswin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.