Lex sits next to 4 phonetic neighbors — Alex, Rex, and Hex are the closest matches by sound. Most share Lex's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men (short for Alexander)"
"reed clearing"
"guardian of prosperity"
"Greece/Ionian (Javan/biblical element)"
"joy, music (original Old English meaning)"
"old friend"
"crooked nose (old Gaelic nickname)"
"marrow of the sea, sea fortress"
"a crow-like black bird"
"prince, leader (from -mir)"
"son of the spear-ruler (Gerald = Geirald)"
"from Laurentum; laurel-crowned"
"crowned one, garland-wearer"
"strength and help of God (combined from Ezra and Azariah)"
"Broken land, marshy area"
"modern invented name with no fixed meaning"
"descendant of Bradan (salmon)"
"sharp hill, ridge"
"light"
"firebrand, burning torch"
"universe, cosmos"
Similar sound: These names share phonetic patterns with Lex — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Lex.
Rhythm: Lex is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.