Aegon sits next to 3 phonetic neighbors — Aiden, Egan, and Aagon are the closest matches by sound. Most share Aegon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fire and blood (fictional Valyrian)"
"noble estate"
"the direction of the rising sun"
"strong as a wild boar"
"barley storage"
"old river; slow-flowing water"
"dark foreigner; dark stranger"
"skilled artisan"
"from the valley"
"an extremely large, uncountable number; boundless"
Similar sound: These names share phonetic patterns with Aegon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Fictional High Valyrian origins, giving them the same cultural heritage as Aegon.
Rhythm: Aegon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.