Sidra sits next to 4 phonetic neighbors — Sierra, Sandra, and Sadia are the closest matches by sound. Most share Sidra's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"like a star, starlike"
"accessible, easy"
"angel, heavenly messenger"
"flexible, yielding"
"read, recite"
"the first woman (Eve)"
"phonetic/aesthetic (various kanji)"
"peaceful song"
"modern melodic invention"
"benefactress, giver of gifts"
"to travel at night"
"moonlight"
"first letter, alif"
"indestructible, eternal"
"night"
"brilliance, luminosity"
"sea of bitterness (via Mary/Myra)"
"one who obtains what she seeks"
Similar sound: These names share phonetic patterns with Sidra — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Sidra.
Rhythm: Sidra is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.