Siham sits next to 3 phonetic neighbors — Siam, Sienna, and Sahar are the closest matches by sound. Most share Siham's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"arrows"
"God's gift; long-lived"
"adornment, beauty (Arabic Zayna connection)"
"innocent, spotless"
"high, exalted, sublime"
"from the Quranic chapter Ya-Sin"
"grace, divine favor"
"water goddess"
"radiant, shining one"
"full of joy, brightness"
"beloved, dear one"
"jewel of the sky, luminous one"
"spiritual, of the soul"
"honey, sweetness"
"sea of sorrow or sea of bitterness"
"silky, smooth"
"love, affection"
"prayer, supplication"
Similar sound: These names share phonetic patterns with Siham — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Siham.
Rhythm: Siham is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.