Sonia sits next to 4 phonetic neighbors — Sonya, Sofia, and Sophia are the closest matches by sound. Most share Sonia's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"wisdom"
"gazelle"
"friend"
"born on Christmas Day"
"of noble kind, noble natured"
"victory of the people (via Colin/Nicholas)"
"whole, universal"
"shining, bright"
"beloved"
"lily (flower)"
"slender, graceful"
"love, affection"
"dweller near the holly trees"
"garden, vineyard, orchard"
"queen"
"place of worship, sacred place"
"youthful, downy-bearded"
"stag meadow"
"youthful, descendant of Julius"
"healer, one who makes whole"
"noble, nobility"
Similar sound: These names share phonetic patterns with Sonia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Slavic origins, giving them the same cultural heritage as Sonia.
Rhythm: Sonia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.