Sianna sits next to 4 phonetic neighbors — Sienna, Shana, and Brianna are the closest matches by sound. Most share Sianna's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"blend of Sienna (city) + Anna (grace)"
"rye meadow, island clearing"
"sailor, sea person"
"pearl"
"my God is abundance"
"my God has answered"
"bright clearing by the hazel"
"highest point, citadel"
"selected, set apart, elect"
"clearing of hazels"
"God is gracious"
"full of happiness"
"youthful, downy-bearded"
"grace, the gracious one"
"storm"
"lady, woman"
"victory of the people"
"to rejoice, joyful"
"heavenly, blind"
"gentle strength, mild power"
"pearl"
Similar sound: These names share phonetic patterns with Sianna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Italian/Hebrew blend origins, giving them the same cultural heritage as Sianna.
Rhythm: Sianna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.