Polli sits next to 4 phonetic neighbors — Polly, Molly, and Holly are the closest matches by sound. Most share Polli's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"star of the sea, beloved"
"shining glory"
"settlement on a cliff"
"From Wales; a foreigner or stranger"
"rosy-cheeked, bright"
"mankind, human being"
"exalted one, high goddess"
"beloved"
"queen (from Regina)"
"little bramble; of the thornbush; possibly auburn-hued"
"star"
"gift of Yahweh"
"elder tree forest"
"flower; blooming"
"star, stars"
Similar sound: These names share phonetic patterns with Polli — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew/Latin origins, giving them the same cultural heritage as Polli.
Rhythm: Polli is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.