Aqua_lung, i used to just use pppconf or is it pppoeconf, just go ppp and hit tabIts sooo easy, why bother doing it the other way even if it exists ?
pppoeconf is the best way to go as the console never gets it wrong.
Then just go to /etc/network/interfaces and change the names and also to /etc/ppp/peers and rename the connection(s).