Kenji sits next to 4 phonetic neighbors — Kenny, Renjiro, and Genji are the closest matches by sound. Most share Kenji's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"strong, vigorous second son"
"Brixis settlement"
"brave in battle"
"born of fire"
"ray of light, bright counsel"
"exalted father (earlier form Abram)"
"dweller by the ridge"
"God is gracious"
"the brown one"
"strong through God, divinely powerful"
"of the Frankish people"
"ruler, sovereign (from Julius Caesar's name)"
"generous, noble, honorable"
"fisherman"
"panache, flair (as in 'cut a dash')"
"great chief, eminent lord"
"brave in battle, vigilant"
"illustrious, famous"
"noble elder"
"wise counselor"
"protector of men"
Similar sound: These names share phonetic patterns with Kenji — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese (健二) origins, giving them the same cultural heritage as Kenji.
Rhythm: Kenji is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.