As a Dane, I must object a bit to the Danes and the Jutes being part of the Germanic tribes. They most certainly were not - they had their own tribes. A theory even suggest than the word Danes originates from the word Danube (the river) and that the Danish tribe actually came from the east (somewhere where current day Russia begins, it seems). Also, the Jutes (as in people from Jutland) could be a tribe called cimbers (don't know what the English word is, though).
The only link between the Danish tribes and the Germanic tribes seem to be that they believed the some god(s), Wotan, Thor, etc. etc. In Denmark this period is called the Viking age from around 750-1050 where the Vikings sailed the world in their longships. And they did get around, from New Foundland in the West to current day Russia in the East as well as the Black Sea to the southeast. So it is indeed possible that they reached modern day Turkey, at least the Bosporus strait (or crossing?)....
The vikings of course also recahed England and Ireland as well as the Orkney and Shetland Island as well Iceland and Faroe Islands and Greenland, of course. Don't know about the Scots, though. And of course also Normandy in France, being so named after the Norse men who lived there. I haven't seen the Dalesdottir story, or quest?, in DA2, though, but I do know that in the Viking age, girls got named after their mother with the mother's name as a lastname+dottir after it. So if Anne had a girl, her last name would be Annesdottir (the daughter of Anne).
Come to think of it, I also seem to remember af wandering tribe called vandals.....
Another group that travels, because they must, is of course the gypsies, today called Romani or Travellers/Wanderers. Much like the Dalish elves, they are eternally on the run, because no-one will have them stay a long time, or even permanent, in one place. Much like the Romani they are forced to travel, probably recalling a time of past gloriousness telling stories about how life was in the ancient elven empire before the fall of Arlathan. Native Americans could also be an inspiration for the Dalish, of course.
I'm not sure they're based off the Masai people in Africa of the arabic nomadic tribes, though.
The Dalish have waggons, caravels, much like the Romani has (or did have) so this would suggest the Romani being a source of inspiration here. City Elves, hower, living in the city alienages - the inspiration here probably comes from both the tragic fate of the hebrews as well as the tragic fate of the Native Americans.
As for the Quanari being loosely based on the Ottoman empire, this is partly true; I remeber Gaider (and some other devs) saying that the philosophy of the Qun are inspired in part by some buddhist teachings, some ancient chinese teachings, particularly Konfutse as well as some ideas from the Ottoman Empire.
[It makes sense, too, as the Qunari does seem to have discovered gunpowder much like Chinese had...]