Astra sits next to 5 phonetic neighbors — Astrid, Esther, and Stella are the closest matches by sound. Most share Astra's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"star, stars"
"steadfast, constant, faithful"
"truth, unconcealedness"
"pleasantness, pleasant one"
"God is my strength"
"paisley pattern, teardrop design"
"cloth merchant"
"grace, favor"
"brave lion"
"heavenly, elevated"
"venerable, august"
"noble meadow (from Old English)"
"little bird"
"from Derby"
"dance, celebration"
"made of gold, golden-colored"
"brightness, brilliance"
"woman from Judea"
"dew of God"
"traveler from far lands"
"pure (via Katherine)"
Similar sound: These names share phonetic patterns with Astra — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Astra.
Rhythm: Astra is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.