Certain clans are traditionally classed as noble clans, referring to their nomadic lifestyle in contrast to the sedentary Sab who are either agropastoralists or artisanal castes. The five noble clans are Hawiye, Dir, Darod, Isaaq and Rahanweyn . Of these, the Dir and Hawiye are regarded as descended from Irir Samaale, the likely source of the ethnonym "Somali (soomaali)". The Isaaq and Darod have separate agnatic (paternal) traditions of descent through Ishaak ibn Ahmed (Sheikh Ishak) and Abdirahman bin Isma'il al-Jabarti (Sheikh Darod) respectively. Both Sheikh Ishak and Sheikh Darod are asserted to have married women from the Dir clan, thus establishing matrilateral ties with the Samaale main stem. "Sab" is the term used to refer to minor Somali clans in contrast to "Samaale". Both Samaale and Sab are the children of their father "Hiil" whose is the common ancestor all Somali clans.