Short form of Alexander, from Greek 'Alexandros' meaning 'defender of the people.'
Lex functions most commonly as a crisp abbreviation of Alexander or Alexandra, names rooted in the Greek Alexandros — a compound of alexein (to defend) and aner/andros (man), yielding the meaning "defender of men." That etymology, carried by one of history's most consequential conquerors, gives Lex an unexpected depth beneath its monosyllabic snap. But Lex also operates as a word in its own right: the Latin lex means "law," giving the name a second layer of meaning that has made it appealing for characters in fiction who deal in power, rules, or their transgression.
The cultural figure who most powerfully shaped modern perceptions of Lex is, of course, Lex Luthor — Superman's arch-nemesis, first introduced in Action Comics in 1940. Luthor was originally conceived as a mad scientist, but over decades of reinvention became something more complex: a brilliant, ruthless industrialist who believes humanity should rely on human ingenuity rather than alien saviors. The name Lex Luthor cleverly fuses the Latin meaning (law) with its bearer's obsessive belief that he alone should determine its terms.
That association gives the name a villain's edge that some parents find intriguingly subversive. Outside of comics, Lex has been worn by real people with considerable style — most notably Lex Barker, the film actor who played Tarzan in the 1950s, and more recently by various musicians and athletes who adopted it as a stage or professional name. As a standalone given name rather than a nickname, Lex has grown in the twenty-first century alongside other short, punchy names like Kai, Rex, and Jax.
It reads as modern and confident, works equally well across genders, and carries enough classical resonance that it never feels merely trendy. For parents who want something short, strong, and quietly interesting, Lex delivers.