Sandra sits next to 4 phonetic neighbors — Cassandra, Sondra, and Saundra are the closest matches by sound. Most share Sandra's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"reborn, born again"
"God is my joy"
"maiden, young girl"
"white settlement"
"child of heaven"
"river of the wolf (Arabic origin)"
"Yahweh is God"
"steward, manager"
"friend"
"daughter of the sea"
"favor, blessedness"
"flat tropical grassland"
"home ruler, estate ruler"
"falling tone, resolution"
"God is gracious"
"my God is Yahweh, the Lord is my God"
"royal child of the sky"
"rose + gentle (folk etymology)"
"healthy, whole (heil)"
"of the Seraphim (angels)"
Similar sound: These names share phonetic patterns with Sandra — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Italian origins, giving them the same cultural heritage as Sandra.
Rhythm: Sandra is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.