Rion sits next to 4 phonetic neighbors — Ryan, Rheon, and Leon are the closest matches by sound. Most share Rion's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little king"
"red-haired fighter"
"my gift"
"strong wolf, wolf valor"
"of royal lineage, kingly"
"to guard, to protect"
"falcon keeper, falconer"
"slender"
"remembered by God"
"army ruler (from Harold/Harald)"
"Carl's island or stronghold"
"God has given (via Nathan blend)"
"wise, clever, intelligent"
"son of Matthew"
"one of the Franks (a Germanic tribe)"
"from the fortified town"
"bright spirit, shining mind"
"free man"
"radiant, brilliant"
Similar sound: These names share phonetic patterns with Rion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Rion.
Rhythm: Rion is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.