Anastacia sits next to 3 phonetic neighbors — Anastasia, Stacia, and Stacy are the closest matches by sound. Most share Anastacia's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resurrection, she who shall rise again"
"sun, of the sun (folk etymology)"
"water forever, eternal waters"
"from Hadria (city near the Adriatic Sea)"
"modest, virtuous"
"gentle, soft"
"God is gracious"
"ancient, venerable, of old times"
"crowned with laurel, victorious"
"admirable"
"freshness, purity"
"bitter, sea of bitterness"
"grace, favor"
"gracious gift"
"graceful meadow (Ana + Lee)"
"well-spoken, of good repute"
"each of the two, torture"
"shining with glory"
"slope, hillside"
"of noble birth"
Similar sound: These names share phonetic patterns with Anastacia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Anastacia.
Rhythm: Anastacia is a 5-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.