Aleksei is a Russian name that is derived from the Greek name Alexios, meaning "defender" or "avenger." It is a strong and masculine name often given to boys who are bold and courageous. People with the name Aleksei are known for their leadership qualities and determination to succeed. They are often ambitious individuals who are not afraid to take risks in order to achieve their goals. Overall, Aleksei is a name that embodies resilience, strength, and a sense of purpose.