Charleston sits next to 4 phonetic neighbors — Charles, Charlton, and Charleston are the closest matches by sound. Most share Charleston's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"free man's town"
"intelligent one"
"from Lucania, southern Italy"
"land of Eoghan (Owen)"
"creative American coinage"
"knight, mounted warrior"
"three (via Trey prefix)"
"victory of the people"
"morning star (Venus before sunrise)"
"tree, oak tree"
"light, radiance"
"possibly derived from Kevin (gentle birth)"
"warrior"
"great one"
"place by the wide ford"
"literary name of uncertain origin"
"hollow"
"church"
"from the Lennox region of Scotland"
"beloved, dear one"
"occupational surname for a mounted messenger"
Similar sound: These names share phonetic patterns with Charleston — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Charleston.
Rhythm: Charleston is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.