Nastassja sits next to 4 phonetic neighbors — Anastasia, Nastasia, and Natasha are the closest matches by sound. Most share Nastassja's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Resurrection, rising again"
"work, effort"
"divine being"
"light, torch"
"the other Aenor (Aliénor)"
"Torch, bright one"
"brightness of the day"
"servant of God"
"hope, aspiration"
"To value, to esteem"
"grace, favor"
"goddess of wisdom and poetry"
"noble, nobility"
"wished-for child"
"majestic, worthy of reverence"
"pure, clear (via Katherine)"
"lion"
"fair, white, blessed"
"famous wolf"
Similar sound: These names share phonetic patterns with Nastassja — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Nastassja.
Rhythm: Nastassja is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.