Haji (Aji) is a Malayic language spoken on the island of Sumatra in Indonesia. A third of the vocabulary is derived from Lampung.
References
^Haji at Ethnologue (18th ed., 2015) (subscription required)
Further reading
Anderbeck, Karl (2007-01-01). "Haji - One Language from Twelve?". Reflections in Southeast Asian Seas: Essays in Honour of Professor James T. Collins. Pontianak: STAIN Pontianak Press. P. 51-91.