Penny sits next to 4 phonetic neighbors — Jenny, Benny, and Lenny are the closest matches by sound. Most share Penny's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"with a web over her face"
"whole, universal"
"summer"
"gray battle maiden"
"amber spark, fire glow clearing"
"pure, innocent"
"combination of Ember (fire) and Lynn (lake)"
"strong, healthy"
"pure"
"gem, jewel"
"sunny place, sunshine"
"ascent, going up"
"one who gathers information, explorer"
"invented name; possibly related to 'life'"
"all, completely beautiful"
"dark, rich (possibly referring to the dark Adriatic waters)"
"gift, grace"
"son of the handsome one"
"leaping water"
"firstborn daughter"
Similar sound: These names share phonetic patterns with Penny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Penny.
Rhythm: Penny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.