Nivan sits next to 4 phonetic neighbors — Nevin, Niven, and Evan are the closest matches by sound. Most share Nivan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"holy, divine"
"light, bright one"
"pure, peaceful"
"narrow strait, channel"
"dark one"
"divine protection, God's helmet"
"rye clearing"
"land of God (via Marrakesh, Berber origin)"
"thankful, God has heard"
"sight, ability to see"
"large meadow settlement"
"from Carlisle"
"variant of Waylon, legendary smith"
"bright navigational star in Orion"
"bear (totem name)"
"sea + beloved (Marion from Mary)"
"royal and bold"
"settlement on a hill"
"from the place of the sturgeon"
"great one"
"bright town"
Similar sound: These names share phonetic patterns with Nivan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish/Gaelic origins, giving them the same cultural heritage as Nivan.
Rhythm: Nivan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.