Taiyo sits next to 4 phonetic neighbors — Taio, Theo, and Tayo are the closest matches by sound. Most share Taiyo's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great positive energy"
"bright, clear"
"brave person"
"spiritual power, authority, prestige"
"diminutive of Antonio"
"brings rain; water-giver"
"bright, clear second child"
"modern melodic creation combining Yama + Mari"
"date palm, palm tree"
"good change, positive transformation"
"old, wise elder"
Similar sound: These names share phonetic patterns with Taiyo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Taiyo.
Rhythm: Taiyo is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.