Schebeck (2001:88) says that this is probably identified with the place name Gapudhäyindimirr in Dhäpuyngu N116.E.
Berndt and Berndt (1964:64) lists this as the name of a mada and associate it with the 'Daboigu' N116.E mala.
Oates and Oates (1970:224) list Gobadeindamiri under 'a dialect mentioned AIAS files but not recorded by Schebeck and say 'no information on this language'.
See also Yolngu Matha N230.
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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).