Cognomen Sigurbjörn (Sigurbjörn 
) , all around the world, is an extremely rare family name. Much more frequently, Sigurbjörn is the forename as well as the last name.
Adam, Úlfarsson, Þorkelsson, Sigurðsson, Arngrímsson, Guðmundsson, Guðmannsson, Óskarsson, Grétarsson, Edvardsson, Ágústsson, Sigurgeirsson, Ragnarsson, Gunnarsson, Valdimarsson, Jakobsson, Hreiðarsson, Eiríksson, Einarsson, Rafnsson, Gestsson, Lárusson, Jónsson, Narfason, Hallsson, Árnason, Ásmundsson, Magnússon, Sveinsson, Björnsson, Karlsson, Guðlaugsson, Jónasson, Jóhannsson, Vilhjálmsson, and Sigurbjörnsson