No, they aren´t. Gustavus = Gustav, Augustus = August.
Reinhard
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http://home.t-online.de/home/R.Riepl/surnames.htm
> Are these forenames somewhat interchangeable, i.e.one Latin one
> German?
No.
Gustaf is Swedish, deriving from "göt" =god and "staf" =staff, support.
Augustus is a Latin adjective =honourable, and became a by-name for emperor
Gajus Julius Caesar Octavianus, the one reigning during the birth of Jesus
Christ, and thus famous from the Christmas story.
($0.02)
Mike
"Gustav Adolf" is a name one often finds in combination, after the great
Swedish king Gustavus Adolphus, who fought against the Catholics in the Thirty
Years War. An American college is also named after him.
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Thomas Kerth, Stony Brook, New York
"Nun, o Unsterblichkeit bist du ganz mein!" (Kleist)