It means do not worry, be happy! It is a Turkish name, and become popular after 1984. Some prefer to say Sevinimu in Greek. It can be ryhmed with name Sevinc, that means cheer, delight. According to legendary, parents give the name of Sevin to their child, because they want their girl to be happy, cheerful and to be loved in her life!
A:You are a dust in the universe, history will forget you, let's have a drink!"
B: Ohh, how sevin you are!