Lonnie sits next to 4 phonetic neighbors — Ronnie, Connie, and Bonnie are the closest matches by sound. Most share Lonnie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ready for battle, noble"
"exalted, sublime, high"
"possibly related to Camila or Kalyla"
"one who works with stone"
"from the valley (from dae)"
"bright-headed, fair"
"courageous, valiant"
"little fire, little fiery one"
"daughter"
"graceful, full of favor"
"dew of the sea"
"golden-yellow color"
"God is gracious"
"woodland clearing, meadow"
"crowned with laurel, victorious"
"fleet of ships, navy blue"
"invented American name, modern creation"
"noble, of noble kind"
"gray-haired, dignified"
"God has afflicted"
Similar sound: These names share phonetic patterns with Lonnie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic (via Alonzo) origins, giving them the same cultural heritage as Lonnie.
Rhythm: Lonnie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.