Hercules sits next to 3 phonetic neighbors — Heracles, Hercule, and Achilles are the closest matches by sound. Most share Hercules's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"glory of Hera"
"appointed by God"
"bright valley"
"dawn, new beginning"
"brave traveler"
"middleman, arbitrator"
"fair warrior, fair hero"
"hazel nut (from avellana)"
"sword/fire (brand element)"
"all + holy (pan + agios)"
"son of the wave, born of the sea"
"one of the Goths"
"strong-willed warrior"
"lord, have mercy (liturgical)"
"of the elm tree, smooth stream"
"red-haired, ruddy complexion"
"court officer, legal summoner"
"modern invented variant"
"little king, kingly"
"possibly inspired by Zion, meaning monument or raised up"
Similar sound: These names share phonetic patterns with Hercules — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Hercules.
Rhythm: Hercules is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.