Tigray are very close to Somalis genetically, which may be due to their origins as the original population of Tigray were Saho people prior to the semitic migration over the Bab el Mandeb.
The Agaw influence is probably more significant in Amhara people, as Agaw people lived between the Takeze river and the Abay (Nile) Northeast of the Mareb was traditional Saho territory and northwest belonged to lowland people of Sudan distantly related to Nubians like Kunama and Nara people.
Between the Mareb and the Takeze was the territory of a now gone people known as the Awa people. The founder of the Aksumite Empire conquered the Awa and built his new capital Aksum in their territory. Adwa is named after the Awa people, Ad Awa. The Agaw lived south and east of the Takeze along the escarpment originally. What is now the main Agaw inhabited area, Agaw Awi, was originally part of the Gumuz kingdom but it was colonized by Agaws during the Zagwe dynasty. The original homeland of Agaw people is now the Amhara homeland, and the original center of Amhara people, Bet Amhara is now called Wollo and is mostly Oromo.