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"
"bright, shining one"
"glory and wolf"
"industrious, hardworking"
"free woman"
"Emerald (folk etymology)"
"magical letter, written symbol"
"youthful, devoted to Jupiter"
"grace, favor"
"Noble appearance"
"Of Apollo; belonging to Apollo"
"Diminutive form of Eleanor, bright and compassionate"
"new day, dawn of a new day"
"bright, shining one"
"hospitable, welcoming to strangers"
"great, venerable, majestic"
"follower of Christ (short for Christopher)"
"wished-for child"
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.