The Yolngu Matha online dictionary describes gurryindi as a clan-nation.
Bowern and James list the linguistic affiliation of Gorryindi (N212) with Yan-nhangu N72, a member of the Nhangu N211 dialect cluster (2010:361-363). In Schebeck,
Gurryindi (N212) is a Yolngu clan listed under the Central and southern sub-groups of Nhangu N211 and affiliated with Dhuwa moiety (2001:15-16).
For Yolngu language groups see Yolngu Matha N230.
Greatorex, John. 2014. Yolngu Matha Dictionary https://yolngudictionary.cdu.edu.au
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).