Helios sits next to 3 phonetic neighbors — Elias, Leo, and Helio are the closest matches by sound. Most share Helios's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sun"
"the Lord saves"
"victory of the people"
"from the Roman Gens Terentia"
"from the market town"
"battle"
"vigilant in war (via Casey)"
"sad, sorrowful"
"beloved, darling"
"modern coinage inspired by Owen/Cowan"
"God supports, God heals"
"from the mountains"
"servant of a noble, warrior retainer"
"one who judges, discerning leader"
"grace, kindness"
"powerful, warrior"
"bramble, thicket"
"white, silver (ancient root)"
"father holds"
"handsome, beautiful"
Similar sound: These names share phonetic patterns with Helios — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Helios.
Rhythm: Helios is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.