Kristoffer Kruken - Ola Stemshaug: Norsk personnamnleksikon, Det Norske Samlaget, Oslo 1995, ISBN 82-521-4483-7
Statistisk sentralbyrå, Namnestatistikk: 11 357 males with the given name Øystein living in Norway on January 1st 2011, with the frequency peak in the 1980s. Accessed on April 29th, 2011.
Etymology
From Old NorseEysteinn, from ey(“luck”) + steinn(“stone”). Cognate with Swedish Östen.