Dilys sits next to 3 phonetic neighbors — Phyllis, Delys, and Dulcie are the closest matches by sound. Most share Dilys's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"genuine, true, perfect"
"bright, shining (via Bertha root)"
"brave and strong"
"joy, happiness"
"bold, to have courage"
"twin"
"brave, strong"
"grove of poplar trees, tree-lined avenue"
"modern coinage with melodic -nell suffix"
"yew warrior"
"fame, reputation"
"star of the sea"
"Blind; sixth; associated with Saint Cecilia, patron saint of musicians"
"flowering, in bloom"
"flowering, in bloom"
Similar sound: These names share phonetic patterns with Dilys — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dilys.
Rhythm: Dilys is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.