Charles sits next to 3 phonetic neighbors — Charlie, Charley, and Carl are the closest matches by sound. Most share Charles's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"free man"
"from Sebastia"
"gift of Yahweh"
"fortunate, good"
"praised, thankful"
"may God strengthen him"
"well-born"
"joined, attached, united"
"soldier, warrior"
"from the city of Milan"
"unbranded cattle (etymological origin)"
"light, bright one"
"God is gracious"
"Priceless; of inestimable worth"
"from the brook"
"Yahweh is deliverance"
"treasurer, bringer of treasure"
"broad valley, broad hillside"
"beloved, may God protect"
"to flow down, descend"
"ash tree town"
Similar sound: These names share phonetic patterns with Charles — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Charles.
Rhythm: Charles is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.