Eon sits next to 4 phonetic neighbors — Ian, Aeon, and Leon are the closest matches by sound. Most share Eon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"age, era, vast expanse of time"
"traveler, crossroads"
"son of Jens (son of John)"
"things to be read/remembered"
"valley dweller"
"clear, bright"
"God is witness"
"keeper of the keys"
"one who has achieved his goal (from Siddharth)"
"hare land, land of hares"
"God sows, God scatters seed"
"lawful, upright"
"He enlightens, God illuminates"
"rye land, land of rye"
"Angel of Death"
"who is like God"
"gap, chasm"
"manly warrior ruler"
"supplanter, heel-catcher"
"servant of Saint John"
"from Londinium, fort on the Thames"
Similar sound: These names share phonetic patterns with Eon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Eon.
Rhythm: Eon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.