Guy's surname is "Wu" and some form system decided that two characters just isn't enough for a last name. Because clearly, every database architect in history assumed all humans follow the same naming conventions. The validation rule says minimum 3 characters, and Wu says "I exist." Meta's official account responding with "wuhoooo!" is either peak corporate humor or someone in their social media team is having way too much fun. Fun fact: This is a classic example of Falsehoods Programmers Believe About Names . Names can be one character, they can have no last name, they can be symbols, they can change daily. Your regex won't save you.