Nissi sits next to 4 phonetic neighbors — Missy, Sissy, and Lissy are the closest matches by sound. Most share Nissi's Hebrew-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"my miracle"
"ascending, sublime, exalted"
"fragrant spice tree"
"harmonious, musical, well-ordered"
"sapphire gemstone, beautiful"
"star (from Persian)"
"who is like God? (rhetorical, implying no one)"
"divine gift, gift of grace"
"angel, messenger of God"
"God exists, gift of God"
"grapevine"
"my God is Yahweh"
"my father is noble"
"two handfuls"
"independent name"
"helped by God, God has helped"
"she who lives"
"fourth letter of the Hebrew alphabet"
Similar sound: These names share phonetic patterns with Nissi — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew (nes = miracle) origins, giving them the same cultural heritage as Nissi.
Rhythm: Nissi is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.