Sadaf sits next to 4 phonetic neighbors — Sadaf, Saraf, and Sadan are the closest matches by sound. Most share Sadaf's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"seashell, mother of pearl"
"sunlight, warmth"
"valley"
"contentment, satisfaction"
"song, melody, air"
"stranger, foreigner"
"resembling a celestial being"
"father's precious jewel"
"clear reflection, seeing clearly"
"night (archaic)"
"fair-haired"
"spiritual, of the soul"
"hidden, secret"
"brightness, cluster of stars"
Similar sound: These names share phonetic patterns with Sadaf — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Sadaf.
Rhythm: Sadaf is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.