Ronnie sits next to 3 phonetic neighbors — Donnie, Lonnie, and Johnnie are the closest matches by sound. Most share Ronnie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"powerful counselor (via Ronald)"
"from the isle"
"from the river Blaan"
"colt keeper, young horse handler"
"bright fame"
"the brown one"
"birth, creation"
"son of the marsh dwellers"
"eagle"
"venerable, revered"
"gift of God, gift of Yahweh"
"crooked mouth, wry-mouthed"
"open land"
"small songbird"
"beloved of God"
"passionate, earnest"
"dweller by the holly"
"western town"
"son of the red warrior"
"aspen tree, quaking poplar"
Similar sound: These names share phonetic patterns with Ronnie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Ronnie.
Rhythm: Ronnie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.