Sonny sits next to 4 phonetic neighbors — Sunny, Benny, and Ronny are the closest matches by sound. Most share Sonny's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son, young boy"
"derived from Calvus, bald"
"Roman pilgrim"
"superlative of magnus (great)"
"son of"
"God is good; Yahweh is good"
"elf counsel, supernatural wisdom"
"birth, nativity"
"graceful willow"
"peaceful ruler"
"fingernail, claw"
"Frankish person"
"eagle"
"keeper of horses, horse servant"
"distinguished, bright"
"divine peace"
"from the brook"
"battle (possible Irish Gaelic root)"
"powerful warrior"
"he who descends, descent"
"divine healer"
Similar sound: These names share phonetic patterns with Sonny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Sonny.
Rhythm: Sonny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.