Reid (1990) says that this is a dialect of Ngan'gityemeri N157, and it is the speech variety of the northernmost Ngan'giwumirri N17 estate group, rak-Merren. Documentation on Ngan'gityemeri N157 may be relevant.
Green and Nordlinger classify Ngan'gimerri as a Southern Daly language closely related to Ngan'gikurunggurr N8 and Ngan' giwumirri N17, with more distant ties to Murrinhpatha N3 and Murrinh Kura N158 (viewed November 2020).
Green, Ian & Nordlinger, Rachel. The Daly Languages (Australia). Web Resource http://dalylanguages.org
Dialect of Ngan'giwumirri spoken by northern-most clan (Reid 1990). spoken at Peppimenarti, Daly River, Nganmarriyanga and Wudipuli. (Blythe 2009:31)
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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).
Reid, Nicholas & Patricia Marrfurra McTaggart. 2008. Ngan'gi dictionary. Armidale: Australian Linguistics Press.