Bonnie sits next to 4 phonetic neighbors — Connie, Ronnie, and Annie are the closest matches by sound. Most share Bonnie's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"beautiful, attractive, pleasant"
"driftwood"
"woman from Magdala"
"fidelity, loyalty"
"oak tree, gazelle"
"plain, field, open land"
"of noble kind"
"dweller at the hall"
"foreign riches, bright one"
"crown, garland"
"bright, luminous"
"from 'Van' + 'Essa' (pet form of Esther)"
"royalty, of noble rank"
"laurel tree"
"melody, air (musical term)"
"high-born chief of the heavens"
"ring of light"
"murmuring rock on the Rhine"
"gift of God (short form of Dorothea)"
"friendly one, ally"
Similar sound: These names share phonetic patterns with Bonnie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish English (bonnie) origins, giving them the same cultural heritage as Bonnie.
Rhythm: Bonnie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.