Johnny sits next to 4 phonetic neighbors — Jonny, Donny, and Ronnie are the closest matches by sound. Most share Johnny's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Yahweh is merciful"
"of the gens Lucia (light)"
"animal enclosure, warren"
"greatest of the Aemilians"
"southern settlement, south farm"
"delight, luxury"
"bold power, chief ruler"
"son of Cole, dark one's son"
"best"
"brave in battle"
"clay settlement, clay worker"
"divine power (from Oswald)"
"free man"
"whole, universal power"
"holy person; one recognized for virtue and closeness to God"
"Lord (via Kyrie element)"
"great town"
"ardor, enthusiasm, fierceness"
"round, barrel-maker"
"son of"
"hollow (place)"
Similar sound: These names share phonetic patterns with Johnny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Johnny.
Rhythm: Johnny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.