Sandy sits next to 3 phonetic neighbors — Andy, Randy, and Sandi are the closest matches by sound. Most share Sandy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"rosemary (when short for Rosemary)"
"bright raven"
"bright raven"
"rough clearing or rough woodland clearing"
"Sun; throne - from Old Persian Kurush meaning one who bestows care"
Similar sound: These names share phonetic patterns with Sandy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Sandy.
Rhythm: Sandy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.