Sonnie sits next to 5 phonetic neighbors — Sunny, Sonny, and Bonnie are the closest matches by sound. Most share Sonnie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sunshine, bright and cheerful"
"cloud, mist"
"state of well-being"
"kneader of bread (original literal meaning)"
"female heir, inheritor"
"princess, flower"
"little honor, dear one"
"from the meadow land"
"industrious, hardworking (associated meaning)"
"calm sea, still ocean"
"member of the Gauts tribe"
"noble, nobility"
"solitary clearing"
"gift from God"
"talent, ability"
"chalice, holy cup"
"life, living essence"
"of the Julii family (related to Julius Caesar)"
"ruler through strength"
"honorable, respectable"
"song thrush, singing bird"
Similar sound: These names share phonetic patterns with Sonnie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English sun + -ie affectionate suffix origins, giving them the same cultural heritage as Sonnie.
Rhythm: Sonnie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.