Green (1989) treats this as a dialect of Marrithiyel N7. There is an article by Tryon (1970).
Green and Nordlinger classify Marri Tjevin as a Western Daly non Pama-Nyungan language along with Marramaninjsji N16, Merranunggu N13, Emmi N15, Menthe N6, Marri Ngarr N102, Makati ke N163, Marrithiyel N7, Marri Ammu N162, and Marri Dan N9 (viewed November 2020).
Green, Ian & Nordlinger, Rachel. The Daly Languages (Australia). Web Resource http://dalylanguages.org
Swamplands at mouth of Moyle River and coastal country near Cape Dombey (Tindale 1974).
Marri Tjevin and Marri Ammu are two closely related dialects whose country lies along the coast north of the mouth of the Moyle River, extending up towards the Dashwood Plains. Marri Tjevin occupies the southern part of this area, with Magati Ke and Marri Ngarr to the south. Marri Ammu then has Menthe and Merranunggu to its north and north-east respectively. Their sister dialect Marrithiyel lies to their east. There are a number of active outstations on Marri Tjevin and Marri Ammu country proper, with Marri Tjevin and Marri Ammu communities also resident at Wadeye (Green & Nordlinger viewd November 2020).
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Wadeye Aboriginal Languages Centre
Batchelor Institute https://www.batchelor.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).