Helen sits next to 4 phonetic neighbors — Ellen, Eleanor, and Elaine are the closest matches by sound. Most share Helen's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
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"torch, shining light"
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"torch, bright one"
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Similar sound: These names share phonetic patterns with Helen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Helen.
Rhythm: Helen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.