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Wila’, also Bila’ and Lowland Semang, are extinct Aslian languages of Malaya recorded on the Wellesley coast opposite Penang in the early 19th century.
References
Geoffrey Benjamin. 2004. 'Aslian languages', 'Aslian: characteristics and usage.', In: Asmah Hji Omar (volume editor), The encyclopedia of Malaysia, volume 12: Languages and literatures, Kuala Lumpur. Archipelago Press, pp. 46–49
Geoffrey Benjamin, 2012. ‘The Aslian languages of Malaysia and Thailand: an assessment.’ In: Peter K. Austin & Stuart McGill (eds), Language Documentation and Description, Volume 11. London: Endangered Languages Project, School of Oriental and African Studies (SOAS), pp.136–230. <www.elpublishing.org/PID/131>