So when you are telling someone your name, "Je m'appelle John", you are saying "I call myself...". If you were to say "Je t'appelle...", with a "t" instead of an "m", then it would means "I call YOU", instead of "I call MYSELF".Likewise, if someone said "Tu m'appelles", then it means "you call ME". So with the "vous" example, the first "vous" is there because it's them who's doing the calling. The second "vous" is there because that's the person they are calling, they are calling themselves something (their name). The word for "you" and "yourself" are both "vous" in that example. The words for "I" and "myself" are different, "je" and "me". The informal words for "you" and "yourself" are also different, "tu" and te".I hope this helps, and if I'm wrong can someone please correct me.
