Sanji sits next to 3 phonetic neighbors — Sanjay, Sanjiv, and Sandy are the closest matches by sound. Most share Sanji's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"third son; three o'clock"
"owner, master"
"the greatest"
"festival, communal celebration"
"decided, resolved, determined"
"green, verdant, growing"
"capable, competent"
"thinking faculty, inner mind"
"warner, one who cautions"
"sight, perception"
"well-known, distinguished"
"pure, clean"
"grateful to God, one who praises"
"ruler, lord"
"of the sword"
"simple, uncomplicated"
"prince, son of a lord"
"rays of light, luminous"
"approval, divine pleasure"
Similar sound: These names share phonetic patterns with Sanji — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Sanji.
Rhythm: Sanji is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.