It is considered that the ethnonym is first attested in anthroponyms Horoúathos, Horoáthos, and Horóathos on the two Tanais Tablets, found in the Greek colony of Tanais at the shores of Sea of Azov in the late 2nd and early 3rd century AD, at the time when the colony was surrounded by Iranian-speaking Sarmatians. However, acceptance of any non-Slavic etymology is problematic because it implies an ethnogenesis relationship with the specific ethnic group. There is no mention of an Iranian tribe named as "Horoat" in the historical sources, but it was not uncommon for Slavic tribes to get their tribal names from anthroponyms of their forefathers and chiefs of the tribe, like in the case of Czechs, Dulebes, Radimichs, and Vyatichi.