Alexei is a Greek-origin name derived from Alexander, meaning "defender of the people." It has been used independently since the Middle Ages and has historical figures like Tsar Alexei I Romanov and Patriarch Alexei II associated with it. In literature, it's known for being the main character in Dostoevsky's "The Brothers Karamazov." Today, Alexei is a popular global name carrying a sense of history, strength, and wisdom.