Harmonii sits next to 4 phonetic neighbors — Harmony, Hermione, and Armoni are the closest matches by sound. Most share Harmonii's Greek/Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"harmony, consonance, fitting together"
"creative feminine form combining Julia and -issa suffix"
"to be of worth, valor"
"royal woodland clearing"
"slender, fair"
"heavenly messengers"
"one who tailors or crafts"
"grace, kindness"
"fair, lovely"
"winding valley"
"firstborn daughter"
"wealthy guardian"
"creative American coinage with loving sound"
"town of Ann"
"modern invented name, blue jay bird"
"queen of the gods"
"sun, of the sun (folk etymology)"
"priceless, praiseworthy"
"worthy of love"
"beautiful, graceful"
Similar sound: These names share phonetic patterns with Harmonii — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek/Latin origins, giving them the same cultural heritage as Harmonii.
Rhythm: Harmonii is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.