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"
"high, exalted"
"unique, one of a kind"
"desiring peace, will and peace"
"son of Rawlin"
"of the mountain, from the mountain"
"to increase, to grow"
"beautiful and good"
"one who makes wheels"
"son of Ty (Tye)"
"free spirit, small but mighty"
"from Sebastia"
"battle spirit"
"son of the sea, great tide"
"supplanter, one who follows at the heel"
"things to be read"
"solitary monk, single house"
"rope maker, bold counselor"
"who is blessed"
"enduring, steadfast"
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.