This is a people name. Previously the code (Y62) in the Languages and Peoples Thesaurus referred to Mbambylmu / Coastal Lamalama. In the early 1960s West recorded a language name 'Mbambyrlmu(ngwa)' which was cited by Tindale as 'Mbambylmu'.
This is actually derived from a clan name for people from Barrow Point, who refer to themselves as Ama Ambilmungu (Y62) in Barrow Point language Y63.1 (Sutton 1993:34). Ama Ambilmungu people speak Barrow Point language Y63.1.
Gambiilmugu is a Guugu Yimidhirr name for this same clan affiliated with the Barrow Point language Y63.1, i.e. Ama Ambilmungu (Y62) (Sutton, 1993:34).
Previously, the Languages Thesaurus listed Gambilmugu as an alternate name for Walmbaria under the code Y61 (see also Y147). There is no evidence to suggest that the Barrow Point language Y63.1 is related to the Lamalamic group; see also Lama Lama Y136.
Cape Melville, Bathurst Head area (Oates 1970:258)
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).