Asuna sits next to 5 phonetic neighbors — Asana, Azuna, and Asuka are the closest matches by sound. Most share Asuna's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Bright future"
"flame, hill"
"meadow of the brave"
"walking, pace, progress"
"sunlit moon, luminous one"
"white, fair"
"pleasure, delight"
"anointed one"
"one who shows mercy"
"gift of God"
"lady, mistress, respected woman"
"creative variant of Maisie"
"mystery, secret"
"beautiful"
"God will add; gracious"
Similar sound: These names share phonetic patterns with Asuna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Asuna.
Rhythm: Asuna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.