Sacha sits next to 3 phonetic neighbors — Sasha, Sascha, and Zach are the closest matches by sound. Most share Sacha's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of mankind"
"flowing water"
"place of glamour and royalty (associative)"
"street"
"greatest conqueror"
"God is gracious"
"bearer of Christ, Christ-carrier"
"victory of the people"
"son of the pearl (via Margaret's meaning)"
"bright, splendid"
"victory of the people"
"king, sovereign"
"world, community"
"winding riverbank, bank with a winch"
"yew tree; bow maker"
"bear"
"who is like God?"
Similar sound: These names share phonetic patterns with Sacha — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Russian origins, giving them the same cultural heritage as Sacha.
Rhythm: Sacha is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.