Johnny sits next to 5 phonetic neighbors — Bonnie, Lonnie, 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
"God is gracious"
"veena; musical lute instrument"
"grace, favor"
"divine protection, infallibility"
"fortress of battle"
"dark, from the Adriatic"
"divine judgment"
"peaceful ruler or eternal ruler (from Erika/Rika)"
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 (Yohanan via John) 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.