Eisuke sits next to 3 phonetic neighbors — Eisuke, Isuke, and Keisuke are the closest matches by sound. Most share Eisuke's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brilliant helper"
"prosperous, equal in rank"
"Bright light, torch, shining one"
"gentle, humble"
"swan (mythological transformed figure)"
"praised, praiseworthy"
"light (from Lucius)"
"God is gracious"
"automotive brand name"
"dweller at the wood"
"to help, to save, to rescue"
Similar sound: These names share phonetic patterns with Eisuke — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Eisuke.
Rhythm: Eisuke is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.