Della sits next to 4 phonetic neighbors — Dell, Dale, and Delta 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 kind"
"Spear ruler; variant of Garrick meaning one who rules with a spear"
"The fifth; fifth-born"
"cloud, world"
"fortunate peace, good fortune and peace"
"a deep, grief-tinged longing for home, the past, or a place that ma..."
"good man, virtuous"
"warrior helmet, battle helmet"
"knowledge, wisdom, intelligence"
"Friend, ally"
Similar sound: These names share phonetic patterns with Della — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German 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.