Sinda sits next to 5 phonetic neighbors — Cindy, Linda, and Sinead are the closest matches by sound. Most share Sinda's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"luminous, shining (via Lucinda)"
"battle horn"
"midsummer, summer solstice"
"Daring, brave"
"all true, completely true"
"bright like a bear"
"fierce in battle"
"narcissus flower, sleep-inducing"
"variant of Chloris, goddess of flowers"
"washed, cleansed; or variant of Lavinia"
"of Rome, Roman woman"
"flowing, moving freely"
"shepherd, friend"
"from Leicester; possibly heavenly"
"little light"
"settlement of the Britons"
Similar sound: These names share phonetic patterns with Sinda — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin lucidus origins, giving them the same cultural heritage as Sinda.
Rhythm: Sinda is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.