Quwanna sits next to 4 phonetic neighbors — Quanna, Shawna, and Tawanna are the closest matches by sound. Most share Quwanna's Modern American-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"modern invented name; no traditional etymology"
"Moon goddess; lady of the rainbow; goddess of medicine and weaving"
"bearer of Christ"
"wished for, longed for"
"beloved, of the tower"
"from France; Frankish person"
"soap, purity"
Similar sound: These names share phonetic patterns with Quwanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Modern American origins, giving them the same cultural heritage as Quwanna.
Rhythm: Quwanna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.