When would this be used? For example, there is "Mein Name ist" and "Ich heiße" for "my name is", so would Vorname be a formal thing? Or could you say "Mein Vorname ist..."
In a document where you have to fill blanks, they could indicate the "familianame" (last name) and the "vorname" (name). Also, if you have a first and a second name, and you want to refer to your very first name, you are talking about your "vorname".