Noun
ethnonym (plural ethnonyms)
The name of an ethnic group, nation, nationality, tribe, tribal alliance, clan, or other ethnic community.
According to Samaritan tradition, however, the Samaritan ethnonym is not derived from the region of Samaria, but from the fact that they were the "Guardians" (Shamerim) of the true Israelite religion. Source: Internet
Iranians soon accepted it as an ethnonym, as is shown by a Persian court official’s referring to mā tāzikān “we Tajiks” (Bayhaqi, ed. Fayyāz, p. 594). Source: Internet
Dimitrov theorized that the differences in the Bulgar ethnonym could be due to the dialect differentiations in their language. Source: Internet
Gradually, the term took on the properties of an ethnonym and was used exclusively to designate Muslim Oghuz, especially those who migrated away from the Syrdariya Basin. Source: Internet
Instead, they avoided the toponym altogether, turning it into an ethnonym. Source: Internet
It is certainly plausible that a flowing river would be given a name that describes it as "pouring", and that, if the original home of the Goths was near that river, they would choose an ethnonym that described them as living by the river. Source: Internet