Joniel sits next to 5 phonetic neighbors — Daniel, Joel, and Nathaniel are the closest matches by sound. Most share Joniel's Hebrew-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"godly, divine"
"name of God"
"king, royal"
"little king"
"king's settlement"
"God is the Lord"
"eighth"
"raven (sacred Celtic bird)"
"little joy"
"God is my salvation"
"mourner"
"one who raids, bold adventurer"
"speckled, freckled"
"wise, clever, intelligent"
"fighter, battle"
"modern variant of Milan/Milen"
"Kent dale, valley settlement"
"allies, friends"
"rye land, land of rye fields"
Similar sound: These names share phonetic patterns with Joniel — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Joniel.
Rhythm: Joniel is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.