Della sits next to 5 phonetic neighbors — Ella, Stella, and Bella are the closest matches by sound. Most share Della's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble, of noble birth"
"whole, universal"
"bird + grace"
"lyre, musical instrument"
"vine, to bind"
"peace, safety"
"light, bright one"
"sun, throne"
"graceful, beautiful"
"she, her"
"my father is joy"
"young woman, maiden"
"orchid flower (Cattleya species)"
"cherished, dear one"
"belief, trust in God"
"supplanter, one who grasps the heel"
"rule, sovereignty"
"shining light, bright one"
"star, heavenly body"
"fairy, enchantment"
Similar sound: These names share phonetic patterns with Della — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Della.
Rhythm: Della is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.