Xian sits next to 4 phonetic neighbors — Sean, Shawn, and Shane are the closest matches by sound. Most share Xian's Chinese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"immortal, celestial sage"
"pure, innocent"
"reddish-haired, ruddy complexion"
"of noble Gascon origin"
"autumn"
"industrious ruler"
"rock, stone"
"heavenly city, promised land"
"follower of the god of wine and festivity"
"noble strength"
"the green one, evergreen"
"a salute, tribute, honor"
"tracker, pursuer"
"modern invented name"
"blind"
"special existence, distinct being"
"elf warrior (alternative etymology)"
"divine command, will of God"
"severe, strict"
"one who hunts with birds (falconer)"
"invented American name, likely a blend of Cash and Ashton"
Similar sound: These names share phonetic patterns with Xian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Chinese Taoist origins, giving them the same cultural heritage as Xian.
Rhythm: Xian is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.