Sonnet sits next to 4 phonetic neighbors — Sonata, Sunny, and Scarlett are the closest matches by sound. Most share Sonnet's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little song"
"meadow near the river"
"fairy queen (folk etymology)"
"beautiful, precious"
"noble kind"
"grace, favor"
"God is gracious, gift of God"
"from the round hill"
"bright, clear, famous"
"little rose"
"glory, fame"
"blessing, unmerited favor"
"Yahweh is merciful"
"crown, garland"
"king's meadow, royal clearing"
"descendant of Caiside"
"fair, pure"
"peace, world"
"wished-for child + of noble kind"
"light"
"well-mannered, polite, graceful"
Similar sound: These names share phonetic patterns with Sonnet — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Italian origins, giving them the same cultural heritage as Sonnet.
Rhythm: Sonnet is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.