Sasha sits next to 4 phonetic neighbors — Sascha, Tasha, and Sable are the closest matches by sound. Most share Sasha's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"crooked river"
"dove"
"sea of bitterness, drop of the sea"
"wealthy protector"
"sadness, melancholy"
"defender of men"
"bright army, famous warrior"
"nobleman, marquess, border guardian"
"male, virile"
"manly, brave"
"destroyer of peace (literal)"
"gift of Artemis, devoted to Artemis"
"speckled, variegated"
"sun, shepherd"
Similar sound: These names share phonetic patterns with Sasha — 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 Sasha.
Rhythm: Sasha is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.