During his lifetime he was known as Olaf 'the fat' or 'the stout' or simply as Olaf 'the big' (Ólafr digri; Modern Norwegian Olaf digre).
Selama hidupnya ia dikenal sebagai Olaf 'si gemuk' atau 'yang gemuk' atau sama seperti Olaf 'yang besar' (Ólafr digri; bahasa Norwegia Modern Olaf digre).