Kaizen sits next to 4 phonetic neighbors — Kaison, Kayden, and Mason are the closest matches by sound. Most share Kaizen's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"continuous improvement"
"glory in battle"
"descendant of Grádaigh"
"sea, ocean (kai component)"
"raven"
"male duck"
"slender"
"to tame, to subdue"
"warrior, man"
"seven; divine completion"
"healer"
"downy-bearded, youth"
"one who carries loads, carrier"
"poet"
"greatest, largest"
"eternal ruler, ever powerful"
"enduring and beautiful"
"Botolph's town, market town"
"from the valley town"
"friend, companion"
"letter J, initial name"
Similar sound: These names share phonetic patterns with Kaizen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Kaizen.
Rhythm: Kaizen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.