Elenna sits next to 5 phonetic neighbors — Elena, Helen, and Eleanor are the closest matches by sound. Most share Elenna's English-origin cluster, so the rhythm and vowel shape carry across the list.
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"starwards, toward the stars"
"religion, religious"
"innocence, beauty"
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"fair warrior, white-haired hero"
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"opulence, indulgence, abundance"
"bright valley"
"God is gracious"
"brown-haired, dark complexioned"
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Similar sound: These names share phonetic patterns with Elenna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Quenya (Tolkien) origins, giving them the same cultural heritage as Elenna.
Rhythm: Elenna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.