Xion sits next to 3 phonetic neighbors — Zion, Shion, and Dion are the closest matches by sound. Most share Xion's Modern-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"invented name; light or replica"
"rhythm, flow, cadence"
"old friend"
"descendant of Riagán"
"brave ruler, strong king"
"resolute fame, desired renown"
"judge"
"dweller at the untilled ground"
"rocky cliff, crag"
"Roman fort on the River Leir"
"saint of God, blessed by God"
"hollow, empty"
"the fifth"
"settlement by the ash trees"
"honest, true, trustworthy"
"great river (geographic)"
"father of peace"
"life"
"creative modern variant of Ashton/Cashton"
"divine, of the god of wine"
"myrrh, fragrant oil"
Similar sound: These names share phonetic patterns with Xion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Modern origins, giving them the same cultural heritage as Xion.
Rhythm: Xion is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.