Sun sits next to 4 phonetic neighbors — Son, Sean, and Sonny are the closest matches by sound. Most share Sun's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the sun, solar light"
"Lord have mercy"
"good speech"
"triumph, conquest"
"like unto God"
"swift as a deer"
"will-bright, famous will"
"from the village of Estry in Normandy, France"
"new house"
"gift from God"
"futility, vanity"
"may God protect"
"fragrant spice"
"journey, voyage"
"empty, hollow"
"high, noble, exalted"
"venerable, worthy of reverence"
"bright-headed"
"new, sky (nav element)"
"hare clearing"
Similar sound: These names share phonetic patterns with Sun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Sun.
Rhythm: Sun is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.