Jun sits next to 3 phonetic neighbors — Juan, John, and Joon are the closest matches by sound. Most share Jun's Chinese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"king, lord"
"keeper of the house"
"game character name of contested origin"
"giraffe"
"intelligent, enlightened"
"flame, bright"
"flower sound"
"beautiful fragrance"
"second of twins"
"mother"
"nautical mile, measure of sea distance"
Similar sound: These names share phonetic patterns with Jun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Chinese origins, giving them the same cultural heritage as Jun.
Rhythm: Jun is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.