Yonkalla Indians. The southernmost Kalapooian tribe, formerly living on Elk and Calapooya Creeks, tributaries of Umpqua River, Oregon. According to Gatschet there were two bands, called Chayankeld and Tsantokau by the Lakmiut, but it seems likely that the former name (Tch’ Ayanke-‘ld) is merely the native tribal name. The tribe is probably extinct.
There are actually descendants of the Yoncalla Tribe still living in Oregon. While the “tribe” may have vanished as an organization, there is historical evidence that tribal members were relocated to the Grande Ronde Reservation. There is a group of natives attempting to renew the Yoncalla language and history. See:
http://web.kitsapsun.com/archive/2000/03-21/0032_oregon__group_claims_to_be_from_t.html