Dexter sits next to 4 phonetic neighbors — Baxter, Chester, and Fletcher are the closest matches by sound. Most share Dexter's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"right-handed, skillful"
"brave in battle"
"ruler of the world"
"son of Egan, little fire"
"noble bright (adal + beraht)"
"son of Jett, black gemstone"
"brook, small stream"
"home ruler"
"to follow a course, leave a mark"
"the cleansing one"
"where roses grow"
"handsome, beautiful"
"the color gray, from the gray lands"
"trustworthy, loyal"
"people's power"
"rocky land, stony ground"
"descendant of Flann (ruddy, red)"
"of the forest; woodland"
"to heal (from iasthai)"
"increase, growth"
"of the Caspian Sea"
Similar sound: These names share phonetic patterns with Dexter — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin dexter origins, giving them the same cultural heritage as Dexter.
Rhythm: Dexter is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.