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"
"God will add; gracious"
"elf ruler (alternative folk etymology)"
"lady, mistress, respected woman"
"follower of Christ"
"lion"
"creative variant of Maisie"
"one who shows mercy"
"pleasure, delight"
"white, fair"
"God is gracious"
"the lovely one"
"defender of the people (from Greek roots of Lex)"
"noble kind, noble type"
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.