Wachagga ni kabila la tatu kwa ukubwa nchini Tanzania.[2]Takwimu za mwaka2003 zinaonyesha kuwa idadi yao ni watu 2,000,000. Hata hivyo kabila hilo ni kama mchanganyiko wa makabila madogomadogo yenye lugha tofauti, jambo la pekee nchini Tanzania.
↑The term "Dschagga" appears to have been first used to refer to a location rather than a group of people. Johannes Rebmann refers to "the inhabitants of the Dschagga" while describing the Taita and Kamba peoples on his first trip to the mountain. It appears that "Dschagga" was the general name given to the entire mountainous region by distant residents who had cause to describe it, and that when the European traveler arrived there, his Swahili guide used "Dischagga" to describe other portions to him in general rather than giving him specific names. For instance, Rebmann on his second and third journeys from Kilema to Machame speaks of "going to Dschagga" from Kilema. The word was anglicized to "Jagga" by 1860 and to "Chagga" by 1871. Because it used to be thought of by Swahillis as a perilous area to visit, Charles New chose the latter spelling and identified it as a Swahili name that meant "to stray" or "to get lost." This was beacuase of the dense forest around the mountain that confused visitors when they entered.