Sweta sits next to 4 phonetic neighbors — Shweta, Shveta, and Sweta are the closest matches by sound. Most share Sweta's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"white, pure, bright"
"moon goddess"
"Variant of Tiana; possibly from Tatiana (fairy queen) or a diminuti..."
"bearer of Christ"
"joyful, festive"
"she who lives, alive"
"gift of God, God has given"
"beloved, of the tower"
"Great tide or great wave of the sea"
"invented name with musical -qua suffix"
Similar sound: These names share phonetic patterns with Sweta — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Sweta.
Rhythm: Sweta is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.