Oh sits next to 5 phonetic neighbors — Bo, Mo, and Jo are the closest matches by sound. Most share Oh's Chinese/Korean (吳)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the state of Wu (ancient Chinese kingdom)"
"warrior, army man"
"God"
"Calm; composed; dignified; of great weight and gravitas"
"wanderer"
"Har (God/Hari) + Fateh (victory)"
"son of Jack, God is gracious"
"eagle friend, noble friend"
"thatcher, roofer"
"nickname name (Thai given name)"
"flowering, flourishing"
"honey, sweet"
"all, completely"
"moral principles, code of conduct"
"sun, radiant light"
"defender of men; little saint"
"exalted, noble, high"
"river crossing dweller"
Similar sound: These names share phonetic patterns with Oh — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Chinese/Korean (吳) origins, giving them the same cultural heritage as Oh.
Rhythm: Oh is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.