Oona sits next to 3 phonetic neighbors — Una, Luna, and Nona are the closest matches by sound. Most share Oona's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lamb"
"little king, royal one"
"thunder goddess"
"poetic dream vision"
"of the clan of Bricius"
"dark one"
"bright light, torch"
"clay, earth (Etruscan root)"
"bright fame"
"high, noble"
"counsel power"
"exalted, high one"
"God is gracious"
"gracious gift, star of the sea"
"holder of the heel"
"gracious, full of grace"
"graceful lily"
"little rock, harmonious"
"beautiful, fine, delicate"
"image, likeness"
Similar sound: These names share phonetic patterns with Oona — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Oona.
Rhythm: Oona is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.