Morelli says (2012:1) Yirraygirr is one of four dialects of a language called Yaygirr E10: Yirraygirr, Yaygirr E10, Yunggaya E9 and Birriin E72. Birihn E72 is generally considered a dialect of Bundjalung E12 (e.g. Crowley 1978 and Sharpe 2005).
Documentation for Yaygirr E10 may be relevant.
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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).