Morgana sits next to 4 phonetic neighbors — Morgan, Morgaine, and Morrigan are the closest matches by sound. Most share Morgana's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sea circle, sea born"
"grace, favor"
"pure, beloved"
"beautiful, lovely"
"hazelnut, wisdom"
"told by God"
"garden, orchard of God"
"pure, clear"
"each of the two (variant etymology)"
"from the hollow"
"fortunate, good"
"light, torch"
"hail, greetings"
"reborn, born again"
"island dweller"
"gracious gift"
"downy-bearded, youthful"
"woman of Delphi"
Similar sound: These names share phonetic patterns with Morgana — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Welsh mor + cant origins, giving them the same cultural heritage as Morgana.
Rhythm: Morgana is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.