Last name Jónas (Jónas 
) , worldwide, is an extremely rare surname. Much more frequently, Jónas is the forename as well as the last name.
Sen, Jóhannsson, Elíasson, Einarsson, Þórisson, Matthíasson, Stefánsson, Guðmundsson, Jakobsson, Tryggvason, Nordquist, Halldórsson, Hjartarson, Friðriksson, Sigurjónsson, Sigurgeirsson, Ragnarsson, Gunnarsson, Johannesen, Jónatansson, Hallgrímsson, Þórðarson, Jónasson, Guðnason, Rögnvaldsson, Karlsson, Hall, Ingi, Email, Huang, Madsen, Arason, Gylfason, Hansen, Sigfússon, Bjarkason, Kristjánsson, Djurhuus, Jónsson, Tómasson, Harðarson, Hreinsson, Unnarsson, Árnason, Magnússon, Birgisson, Björnsson, Bjarnason, Guttesen, and Engilbertsson