I want to know the answer to the following question:
In what century was the term 'Somali' first used?
All the background I'm provided with is that "An Ancient Chinese document from the 9th century referred to the northern Somali coast — which was then called "Berbera" by Arab geographers in reference to the region's "Berber" (Cushitic) inhabitants — as Po-pa-li.". Is that enough to answer the question?