The online Yolngu Matha dictionary lists mininggirri (N118) but does not provide a defintion.
In his grammar of Ritharrngu N104 Heath (1980:2) that Mininggiri (N218) and Buwarpuwar N217 are sub-groups of Bunančini N123 mata (1980:2) Wilkinson lists Mininggiri under Ritharrngu N104.
For Yolngu languages see also Yolnu Matha N230.
(Ritharrngu)
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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).