[[File:Mohammad Bagher Ghalibaf.jpg|bawd|Y Cwrd Mohammad Bagher Ghalibaf, Maer [[Tehran]].]]
Mae llawer o Gyrdiaid yn ystyried eu hunain yn ddisgynyddion y Medes (neu'r Mediaid) hynafol, ac mae nhw'n defnyddio [[calendr]] sy'n dyddio o 612 CC, pan lwyddodd y Medes i goncro y brifddinas Asyraidd [[NinevehNinefeh]].<ref name="Iranica Frye">{{cite encyclopedia |last=[[Richard N. Frye|Frye]] |first=Richard Nelson | title= IRAN v. PEOPLES OF IRAN (1) A General Survey | encyclopedia=Encyclopædia Iranica | accessdate=2016-03-04|url=http://www.iranicaonline.org/articles/iran-v1-peoples-survey}}</ref> Pobl o [[Iran]] oedd y Medes.<ref name="West2009">{{cite book|author=Barbara A. West|title=Encyclopedia of the Peoples of Asia and Oceania|url=https://books.google.com/books?id=pCiNqFj3MQsC&pg=PA518|date=1 January 2009|publisher=Infobase Publishing|isbn=978-1-4381-1913-7|page=518}}</ref>). Caiff y syniad hwn eu bod o dras Mediaidd ei gadarnhau ganddynyt yn eu hanthem genedlaethol: "ni yw plant y Mediaid a'r ''Kai Khosrow''".<ref name="Bengio2014">{{cite book|author=Ofra Bengio|title=Kurdish Awakening: Nation Building in a Fragmented Homeland|url=https://books.google.com/books?id=caCDBAAAQBAJ&pg=PA87|date=15 Tachwedd 2014|publisher=University of Texas Press|isbn=978-0-292-75813-1|page=87}}</ref>
Amcangyfrifir fod rhwng 30-32 miliwn o gyrdiaid drwy'r byd ac o bosib, cymaint a 37 miliwn.<ref>Gweler: ''World Factbook'' - ''A Near Eastern population of 28–30 million, plus approximately 2 million diaspora gives 30–32 million. If the highest (25%) estimate for the Kurdish population of Turkey, in Mackey (2002), proved correct, this would raise the total to around 37 million.''.</ref>
