What is "eysteinsson"

Eysteinsson is a Scandinavian surname. Notable people with the surname include:

• Halfdan Eysteinsson, the subject of Hálfdanar saga Eysteinssonar, a legendary saga from early 14th century Iceland
• Rognvald Eysteinsson, founder of the Earldom of Orkney in the Norse Sagas
• Sigtryg Eysteinsson, king of the Norwegian petty kingdoms Raumarike and Hedmark in the 9th century
• Sigurd Eysteinsson (aka Sigurd the Mighty, ruled circa 875–892), the second Viking Earl of Orkney