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It reads "Arne Saknussem", just as the text states.
Easiest cipher ever to decode.
I first solved this when I was nine or ten.
Note that one third of the English alphabet, 8 letters (AEKMNRSU), including three of the five vowels (AEU), are in that one short inscription. It would not take much more to fully decipher more complex text. Think "Wheel of Fortune".
This turns up on a Google search which fills in much of the remaining alphabet:
A B C D E F G H I J K L
M N O P Q R S T U V W