Zaire sits next to 4 phonetic neighbors — Zane, Xavier, and Zayne are the closest matches by sound. Most share Zaire's African-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"river that swallows all rivers"
"kingly"
"lion"
"royal ruler"
"substitute, replacement"
"son, born of"
"one who carries loads, carrier"
"red"
"Currency"
"son of Jens (son of John)"
"from Santino (little saint)"
"warrior, strong fighter (fan interpretation)"
"befitting a king"
"slender, thin"
"from Brix (place name)"
"divine messenger"
"graceful willow"
"to rule as monarch"
"rocky land, stony ground"
"glory in battle"
"strength, force"
Similar sound: These names share phonetic patterns with Zaire — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Bantu origins, giving them the same cultural heritage as Zaire.
Rhythm: Zaire is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.