Yuna sits next to 3 phonetic neighbors — Luna, Una, and Juna are the closest matches by sound. Most share Yuna's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sea hibiscus tree"
"short form of Emma or Emilia"
"pure world beauty"
"keeper of keys"
"noble, enlightened one"
"sea, ocean"
"clear and beautiful"
"from Rome, strength"
"wise child, elder sister"
"seaweed (edible)"
"brilliant, intelligent"
Similar sound: These names share phonetic patterns with Yuna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Okinawan origins, giving them the same cultural heritage as Yuna.
Rhythm: Yuna is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.