Isma sits next to 3 phonetic neighbors — Ismay, Isma, and Izma are the closest matches by sound. Most share Isma's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"safeguarded, protected by God"
"from Hadria, the dark city"
"grace, favor"
"divine judgment"
"fortified battle"
"God is gracious"
"veena; musical lute instrument"
"peaceful ruler or eternal ruler (from Erika/Rika)"
Similar sound: These names share phonetic patterns with Isma — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Isma.
Rhythm: Isma is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.