Karthik is a traditional South Indian name that means "light" or "one who is shining bright." It is a popular name among Tamil-speaking people and is often given to boys born during the Hindu month of Kartika. Karthik is often associated with qualities such as intelligence, creativity, and leadership. People named Karthik are known for their strong work ethic, determination, and ability to overcome challenges. Overall, Karthik is a name that carries a sense of brightness and positivity, symbolizing a person who brings light and energy to those around them.