Hyon sits next to 3 phonetic neighbors — Hyun, Hyeon, and Hyon are the closest matches by sound. Most share Hyon's Korean-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Virtuous, worthy, able"
"Branch; fern or bracken"
"champion, lord"
"coined American name; no classical etymology"
"raging flow"
"devoted to Demeter, goddess of harvest"
"great, majestic"
"already; already seen"
"stream, rivulet, small river"
"modern invented name; possibly derived from Toronto place name"
"son of Jesse / son of Jens"
"angel, divine messenger"
"the metal iron, element of strength and endurance"
"sun of the faith, sun of religion"
Similar sound: These names share phonetic patterns with Hyon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Korean origins, giving them the same cultural heritage as Hyon.
Rhythm: Hyon is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.