Sighvatur _ORSTEINSSON (ABT. 1580 - )
Sigurdur _ORSTEINSSON (ABT. 1500 - 1562)
Skúli _ORSTEINSSON (ABT. 970 - )
Stefán _ORSTEINSSON (ABT. 1762 - )
Sćmundur _ORSTEINSSON (ABT. 1340 - )
Sídu-Hallur _ORSTEINSSON (ABT. 945 - )
Torfi _ORSTEINSSON (ABT. 1568 - 1622)
_orgeir _ORSTEINSSON (ABT. 972 - )
_orgils _ORSTEINSSON (ABT. 912 - ABT. 940)
_orgrímur _ORSTEINSSON (ABT. 938 - 962)
_orgrímur 'hái' _ORSTEINSSON (ABT. 1010 - )
_orkell 'máni' _ORSTEINSSON (ABT. 918 - 985)
_orlákur _ORSTEINSSON (ABT. 1435 - )
_orsteinn _ORSTEINSSON (1791 - 1868)
_orsteinn _ORSTEINSSON (ABT. 1582 - )
_órdur _ORSTEINSSON ( - )
_órdur _ORSTEINSSON (ABT. 1380 - )
_órdur _ORSTEINSSON (ABT. 981 - )
_órólfur 'smjör' _ORSTEINSSON (ABT. 848 - )