Daiki sits next to 3 phonetic neighbors — Daiku, Daigo, and Taiki are the closest matches by sound. Most share Daiki's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Great radiance or brilliance written with kanji for large and radiance"
"blacksmith, ironworker"
"the new house"
Similar sound: These names share phonetic patterns with Daiki — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Daiki.
Rhythm: Daiki is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.