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"
"child of light"
"lake, pool (from Lynn)"
"torch, light"
"home power, estate ruler"
"priceless, inestimable"
"forever flowering"
"bright, beautiful"
"from the sky, heavenly"
"Hospitable, guest-friend"
"heavenly, divine"
"combination of Mary and Lena"
"my God is Yahweh"
"west meadow, western woodland clearing"
"vigilant, watchful"
"alert, watchful in battle"
"beautiful, lovely"
"gentle, bright day"
"king's meadow or island"
"shining with glory"
"Tinsley's field or meadow"
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.