Koch's analysis of grammatical materials and comparison of vocabulary lists leads to the conclusion that the Canberra language and Wolgal / Walgalu S47 along with Ngarigo S46 the language of the Monaro, are dialects of the same language (2010:149-150).
Koch proposes a people name: Nyamudy-midhang for the Canberra region, based on historical records of the word Namwich, Namitch, and Yammoit Mittong. The latter is a term on many Alpine group names, the other word is presumably the same as Namadgi (2010: 137).
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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).