Dex sits next to 4 phonetic neighbors — Rex, Hex, and Max are the closest matches by sound. Most share Dex's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"right-handed, skillful"
"vigilant in battle (from Casey/Cathasach root)"
"priest"
"dark one, black-haired"
"related to Everett (brave boar)"
"powerful, mighty"
"God is gracious"
"to carry, to endure"
"supplanter (via Jacob/Kobe etymology)"
"new house"
"creative elaboration, bold individual"
"God is gracious, Yahweh is gracious"
"brother (informal)"
"modern invented name"
"hawk"
"grace of God + home ruler"
"he to whom it belongs"
"modern American invented variant of Zayd"
"talent, ability, brilliance"
"night visitor, one who arrives at dawn"
"anointed one"
Similar sound: These names share phonetic patterns with Dex — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Dex.
Rhythm: Dex is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.