Oleg is a name of Slavic origin, specifically from Russia and other Eastern European countries. It is derived from the Old Norse word 'Helgi', which means "sacred" or "holy". Oleg was popularized by the medieval Varangian ruler Oleg of Novgorod, who played a significant role in establishing the Rurik Dynasty around the 10th century. The name has since been widely used throughout Eastern Europe and beyond. In its diminutive forms, Oleg can be referred to as Olesya for females or Oleq for those who prefer a more modern spelling. Despite its historical roots, Oleg remains a popular choice today, carrying with it a rich cultural heritage and strong connection to Eastern European history.
"Oleg has seen a steady increase in popularity from the late 1990s to around 2011-2014, with over 20 births recorded annually during this period. However, there's been a notable decrease since then, with fewer than 15 births per year from 2016 onwards."