Abby sits next to 3 phonetic neighbors — Abbey, Abbie, and Gabby are the closest matches by sound. Most share Abby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"my father is joy"
"holy bridge place"
"from the Parisii Celtic tribe"
"beloved (folk etymology)"
"defender of mankind"
"marshy area near a stream"
"maiden of the coral sea"
"flowering, blooming"
"noble and gracious"
"full of love"
"lace-like, delicate"
"famous warrior"
"ring of light"
"peace (related to Ériu)"
"island of wild boars (alternative etymology)"
"festivity, abundance"
"strong woodland"
"living creature"
"clearing on the hill"
"shelter, protection"
"of noble kind"
Similar sound: These names share phonetic patterns with Abby — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Abby.
Rhythm: Abby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.