Oswald sits next to 4 phonetic neighbors — Gerald, Harold, and Osbert are the closest matches by sound. Most share Oswald's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"divine power, God's rule"
"bright color, vitality"
"variant of Garrett/Gerald"
"of love"
"atmospheric mist, haze"
"descendant of the hound of valor"
"God heals, God supports"
"enlightenment, awakening"
"son of the prince (elaborated form)"
"generous, tolerant"
"leopard, swift and agile"
"the blessed one"
"ancient, enduring"
"son of the sea (via Dylan influence)"
"the fifth"
"hard grey quartz, fire-making stone"
"creative spelling of Rustin"
"strength of God, God is my light"
"twin"
"powerful army"
"first, beginning"
Similar sound: These names share phonetic patterns with Oswald — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English os weald origins, giving them the same cultural heritage as Oswald.
Rhythm: Oswald is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.