Dahlia sits next to 4 phonetic neighbors — Delia, Dalia, and Lydia are the closest matches by sound. Most share Dahlia's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"flower named for botanist Anders Dahl"
"fair, white, pure"
"free woman"
"noble one, leader"
"hero, heroine (variant of Hayley)"
"goddess of the rainbow, messenger of the gods"
"descending river"
"Rival; to emulate; eager"
"industrious, striving"
"forest, wood"
"illustrious, renowned"
"intoxicating one, mead-like"
"the raven, large black crow"
"jasmine flower"
"open, treeless grassland"
"divinely beautiful, god's beloved"
"From the Hebrew 'Delilah'; the biblical Delilah was the lover of Sa..."
"peaceful, complete"
"pale, fair"
"torch, the bright one"
"youth-producing, ever-young"
Similar sound: These names share phonetic patterns with Dahlia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Swedish/Neo-Latin botanical origins, giving them the same cultural heritage as Dahlia.
Rhythm: Dahlia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.