Jaffer sits next to 4 phonetic neighbors — Jafar, Jeffrey, and Jafer are the closest matches by sound. Most share Jaffer's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"stream, rivulet, small river"
"creative American variant"
"angel, divine messenger"
"dweller by the Rhine river"
"devoted to Demeter, goddess of harvest"
"Virtuous, worthy, able"
"great, majestic"
"sun of the faith, sun of religion"
Similar sound: These names share phonetic patterns with Jaffer — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Jaffer.
Rhythm: Jaffer is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.