Sianni sits next to 5 phonetic neighbors — Sienna, Siani, and Shani are the closest matches by sound. Most share Sianni's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"daughter of Helen (by association)"
"faithful, good"
"God is gracious"
"truthfulness, sincerity"
"reed clearing, cleared wood"
"the other Aenor / bright one"
"pure, clear"
"compatriots, fellow countrymen"
"happiness, fortune"
"sweet basil"
"farmer, earth-worker"
"alive, living, lively"
"from the Caecilius family"
"pear tree"
"otherworldly paradise"
Similar sound: These names share phonetic patterns with Sianni — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew Yochanan via Welsh Siân origins, giving them the same cultural heritage as Sianni.
Rhythm: Sianni is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.