Ok if anyone want a direct quote from the wiki here you go:
"Two of the human tribes that arrived in Thedas, the Ciriane and Inghirsh, settled in the region that became known as Orlais and were the ancestors of modern Orlesians. The Ciriane settled in central Orlais and were loosely defined and culturally rich. The Inghirsh, who settled in north Orlais, were easily defeated in their conflict against the Neromenians, as they were a decentralized and nomadic people. The Ciriane people, on the other hand, were largely isolated and remained a strong and distinct group until the founding of Orlais. In modern times, Ciriane culture has all but disappeared"
Also:
"When the Alamarri peoples first split from Neromenians and migrated south in -1220 TE,[3] they found a new homeland and called it "Ferelden", which means "fertile valley" in their tongue.[4] However, the fertile valley did not become a nation for another 2800 years. This period of time is littered with numerous wars the Alamarri tribes waged, both with foreign powers such as the Tevinter Imperium, as well as their fellow tribes. During that time the Alamarri developed their political system which remains largely intact to this day. With time, powerful nobles would turn their land into bannorns, then arlings, and finally teyrnirs. The nobles continued the Alamarri tradition of infighting and continued to fight with each other over petty matters in order to gain more power. A few of the most powerful Alamarri put forward their bid for kingship over the Alamarri, but without success."
In short Maria was right, thank you for settling whether or not they were different ethnicities.