Drex sits next to 4 phonetic neighbors — Rex, Drex, and Flex are the closest matches by sound. Most share Drex's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Modern invented name with powerful, dynamic connotations"
"frozen water, crystalline coolness"
"Bright and splendid"
"fat tail, referring to a grouping of stars"
"merry, good-natured"
"valley of pigs"
"of the highest class or quality"
"narrow strait, channel"
"brilliantly renowned"
"from the white meadow"
Similar sound: These names share phonetic patterns with Drex — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English origins, giving them the same cultural heritage as Drex.
Rhythm: Drex is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.