Obi sits next to 4 phonetic neighbors — Obey, Kobi, and Tobi are the closest matches by sound. Most share Obi's African-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"child born at a prosperous time"
"son of Morris/Maurice"
"famous land, fame of the land"
"night"
"modern invented name, literary creation"
"new town"
"forgetting, making forget"
"golden chamber, bay window"
"brave in battle (via Casey etymology)"
"dweller near ash trees"
"sword"
"one who carries Christ within"
"meadow dweller"
"speed of God"
"modern invented name"
"one who comes after; steward"
"from Arcy (place name)"
"son of Ben"
"Yahweh has shown favor"
"settlement of Holston, holly stone homestead"
Similar sound: These names share phonetic patterns with Obi — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Igbo origins, giving them the same cultural heritage as Obi.
Rhythm: Obi is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.