Isis sits next to 3 phonetic neighbors — Iris, Isys, and Ysis are the closest matches by sound. Most share Isis's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"throne, seat of power"
"beautiful, rosebud"
"most holy"
"messenger of the gospel"
"defender of men"
"she who entangles men"
"most holy"
"work, labor"
"gracious gift of God"
"primordial earth goddess"
"safe, unharmed"
"protector, she who defends"
"heavenly, sky (Polynesian element lani)"
"gift of Isis"
"torch, bright one"
Similar sound: These names share phonetic patterns with Isis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Ancient Egyptian origins, giving them the same cultural heritage as Isis.
Rhythm: Isis is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.