Koji sits next to 3 phonetic neighbors — Cody, Kogi, and Kobe are the closest matches by sound. Most share Koji's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"luminous second son"
"shrine maiden"
"Dracula spelled backwards (fictional)"
"short form of Richard (brave power)"
"great one"
"earth, sea"
"to move lightly, graceful joy"
"shade, silhouette"
"authority, firm determination"
"precious, valuable"
"luminous hero"
Similar sound: These names share phonetic patterns with Koji — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese ko (light) and ji (second son) origins, giving them the same cultural heritage as Koji.
Rhythm: Koji is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.