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"
"rule, sovereignty"
"plain, field, open land"
"noble kind, of noble birth"
"diminutive of Eve or Evelyn"
"goddess of the hunt and moon"
"bent river or stream"
"star of the sea (via Mary)"
"son of Cionaodh"
"invented name: Jo + lene"
"sea ruler"
"angelic, messenger of God"
"nourishing, kind"
"God is my Lord, God's grace"
"cheerful, bright like the sun"
"of gold, golden-haired"
"free-born, noble"
"wood, forest"
"of the elm grove"
"black, dark-colored"
"symbol of peace and wisdom"
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.