Zayvian sits next to 5 phonetic neighbors — Xavier, Zavier, and Zavian are the closest matches by sound. Most share Zayvian's Basque via Xavier-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"new house"
"swift, quick"
"holder of the heel, supplanter"
"allies, friends"
"island meadow"
"peace (folk etymology)"
"deep blood-red color"
"friend, companion"
"from the place of Einion"
"night"
"descendant of Raghallach"
"from the rippling water"
"son of Mart (Martin)"
"beloved"
"rain, precipitation"
"clear, tinkling sound"
"son of the dark one (via Maurus)"
"fighter, battle"
"son of Hendrik"
"God is gracious"
"to flow down; to descend"
Similar sound: These names share phonetic patterns with Zayvian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Basque via Xavier origins, giving them the same cultural heritage as Zayvian.
Rhythm: Zayvian is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.