Ivan. Ivane is vocative case, i.e. it’s used when you’re talking to someone or calling him. F.e. “Ivane, ela tuka, bre!” (Come here, Ivane!), as opposed to “Ivan doyde vednaga.” (Ivan came immediately).

As for folk songs concerning drinking, I personally prefer this one:

Though, of course, the classic drunkards’ song is this one.