Darleth sits next to 4 phonetic neighbors — Darlene, Darla, and Marleth are the closest matches by sound. Most share Darleth's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"tenderly beloved, darling"
"little ruler with grace (from Riley + Ella roots)"
"divine calling, life mission"
"creative K-variant of Nova"
"bird-like"
"glowing breeze"
"abundance, growth"
"remedy, cure"
"the dark one, she of darkness"
"brave, powerful ruler"
"boomerang"
"pure"
"moon, moon goddess"
"God helps, divine help"
"supplanter's descendant"
"sublime, lofty"
"candle, vigil light"
"valley grace"
"grace"
"from Syria, of Syrian origin"
"of the eternal city"
Similar sound: These names share phonetic patterns with Darleth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Old French origins, giving them the same cultural heritage as Darleth.
Rhythm: Darleth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.