Nelle sits next to 4 phonetic neighbors — Nell, Nellie, and Belle are the closest matches by sound. Most share Nelle's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining one"
"helped by God"
"power, dominion"
"creative variant of Leilani/Keilani"
"twin"
"Defender; one who defends or helps (from alexein)"
"linden tree meadow"
"teacher; one who is strong"
"wanderer"
"garden, vineyard"
"weary"
"azalea flower"
"hare meadow"
"hares meadow, meadow where hares play"
"a day's travel; life's path"
"helpful, descendant of the helpful one"
"fire, warmth"
"Ireland; from the island of Ireland"
"Noble kind; of noble nature (from adal + heid)"
"woman"
"heavenly child, child of the sky"
Similar sound: These names share phonetic patterns with Nelle — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Latin origins, giving them the same cultural heritage as Nelle.
Rhythm: Nelle is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.