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"
"holy, divine"
"maile vine (sacred Hawaiian plant)"
"pre-dawn wisdom"
"Little red one"
"related to Cash, from Old French casse meaning chest or box"
"marked by strength, powerful one"
"to rejoice"
"fruitful, productive"
"industrious ruler"
"noble valor, kingly"
"created name combining day and great"
"long life"
"sun (Coptic tradition)"
"son of Uaid (Walter)"
"bald dove"
"forest ranger, game warden"
"elf counsel, wise counselor"
"king + world (folk etymology)"
"divine, godly"
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.