Adele sits next to 3 phonetic neighbors — Adela, Adeline, and Adell are the closest matches by sound. Most share Adele's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble, nobility"
"bringer of destruction"
"divine gift"
"grace, favor"
"from Rome"
"son/child of Kenneth (the handsome)"
"dark, rich (possibly referring to the dark Adriatic waters)"
"lily flower, purity"
"elm grove"
"feminine of Michael (gift of God in folk etymology)"
"invented name: Jo + lene"
"breeze, breath, air"
"olive"
"pearl"
"precious gemstone formed in oysters"
"son of the sea, great tide"
"freedom, the condition of being free"
"high tower"
"purple violet flower"
"Mary's gold, golden flower of Mary"
"sea, ocean"
Similar sound: These names share phonetic patterns with Adele — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Adele.
Rhythm: Adele is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.