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"
"the lovely one"
"anointed one"
"meadow of the brave"
"merciful, compassionate"
"From Saint-Denis, France"
"creative variant of Maisie"
"white, fair"
"elf ruler (alternative folk etymology)"
"noble kind, noble type"
"sunlit moon, luminous one"
"rejuvenation, renewal"
"noble woman"
"defender of mankind"
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.