Siya sits next to 3 phonetic neighbors — Sia, Ziya, and Sian are the closest matches by sound. Most share Siya's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"we are growing, gratitude"
"light, shining"
"tender, gentle, soft"
"river, flowing water"
"first, primordial, the very beginning"
"successful"
"pleasant, benevolent"
"quiet, tranquil, peaceful"
"noble, respectable"
"sweet-faced, graceful aspect of Durga"
"rocky hill, hill of kings"
Similar sound: These names share phonetic patterns with Siya — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Zulu/Xhosa origins, giving them the same cultural heritage as Siya.
Rhythm: Siya is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.