Jiren sits next to 3 phonetic neighbors — Karen, Darren, and Warren are the closest matches by sound. Most share Jiren's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"powerful, compassionate (fictional origin)"
"that which is about to arrive"
"God is good"
"ruler of the world"
"wealthy, prosperous"
"little fire (via Aidan)"
"descendant of Bradan (salmon)"
"white, fair-complexioned"
"acquired, possession"
"occupational name for a burner of coal or lime"
"new house"
"flourishing, like a flower"
"modern American coinage"
"little Hugh, small-hearted one"
"asked for, prayed for"
"man, manly"
"joyful, jovial (from the same root)"
"variant of Oswin or Ervin"
"dweller at the edge of town"
"son of Gregory"
"permanent, perennial"
Similar sound: These names share phonetic patterns with Jiren — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese/Fictional origins, giving them the same cultural heritage as Jiren.
Rhythm: Jiren is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.