A quick definition of given name:

A given name is the name that a person is given at birth, which distinguishes them from others. It is also known as a personal name or first name. A person's full name includes their given name, middle name (if any), and surname. A legal name is the name recognized by law, which may or may not be the same as a person's given name. A nickname is a name given to a person as a term of endearment or familiarity. A tradename is a name used to identify a business or product.