Polly sits next to 4 phonetic neighbors — Molly, Holly, and Dolly are the closest matches by sound. Most share Polly's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"star of the sea; beloved"
"modest, faithful (flower symbolism)"
"culturally associated with grace and strength via Patrick Swayze"
"alder tree settlement"
"graceful lily"
"woman of Magdala, beloved"
"cinnamon tree, spice plant"
"grace, favor"
"God will increase, God will add"
"God beholds, foresight"
"female traveler, voyager"
"desired, wished for"
"bright shining light"
"foreign, true"
"little Eliot"
"slender, elegant"
"God has heard"
"drooping branch, destiny"
"modern invented name"
"high ground"
"pearl"
Similar sound: These names share phonetic patterns with Polly — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Latin origins, giving them the same cultural heritage as Polly.
Rhythm: Polly is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.