Theron sits next to 4 phonetic neighbors — Theron, Aaron, and Baron are the closest matches by sound. Most share Theron's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pursuer, one who seeks"
"enclosed pasture by a river"
"God is gracious"
"of the Caspian Sea"
"healer, physician"
"grey fortress, grey stronghold"
"place name: town in Pembrokeshire, Wales"
"possibly from Basque or Persian place names"
"God is salvation"
"short form of Matthew"
"my God is Yahweh"
"twin"
"honorable"
"settlement near a tree stump"
"free man"
"strong power"
"possibly derived from Kevin (gentle birth)"
"modern invented name"
"luxurious softness"
"from the Lennox region of Scotland"
Similar sound: These names share phonetic patterns with Theron — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Theron.
Rhythm: Theron is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.