Harmony sits next to 3 phonetic neighbors — Hermione, Melanie, and Brittany are the closest matches by sound. Most share Harmony's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"musical concord, agreement"
"afloat, calm as still waters"
"descending river"
"hay meadow, hay clearing"
"grace, favor"
"work-power, industrious leader"
"feminine diminutive of Gabriel"
"ash tree woodland clearing"
"heart"
"fleet of ships"
"myrtle"
"shining, bright"
"half, partial"
"sunlight, beam of light"
"of the Julian family (Gens Julia)"
"grassy field, open pasture"
"noble, of noble kind"
"resurrection"
"graceful, beautiful"
"lady, queen"
"hill, mound"
Similar sound: These names share phonetic patterns with Harmony — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek harmonia origins, giving them the same cultural heritage as Harmony.
Rhythm: Harmony is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.