Post-Mongol invasion Iraq

[Aren]

You're taking mixed mode way too literally. According to my eurogenes oracles, I am 95% North Dutch and 5% Tajik despite being a British-German mix.
For example, I almost never get English or German in my mixed mode despite having documented and significant ancestry from both countries.

That's cause NW Euros are very close to one and other and only differ in certain shared components. Meanwhile these Arabs I posted score African and East Asian which we lack and higher South Asian and North Atlantic/Baltic for a supposedly native Mesopoamian + Arab mix. And no actually we would see Assyian or Kurdish Jew or Georgian Jew popup in atleast some of the 20 variation but nope.
Some Syrians might be partly Mesopotamian, maybe if more people get tested but so far the Syrian sample seems quite distinct and much more Levantine + some Arabian like. Iraqi Arabs are very diverse and basically Iranic + Arabian most of the time.

[StonyArabia]

Highly informative. I still believe the Iraqi Arab population is mostly indigenous Mesopotamian.

Not really. The Iraqi Arab population is mostly Arabian and Arabized Iranian(depending on the region). The Mesopotamian elements seemed to have been wiped out by the Mongols. The only reason the Christians were spared because of Dokus Khatun who was Christian and thus Hulgu did not massacre them like the Muslim population. However Timur would force most of the Christians to convert to Islam in the region and kill them. Not to mention that Iraq was completely depopulated and would only be repopulated by Arabian Bedouin tribes, and Persian tribes escaping the political turmoil created by post-Mongol invasion. Not to mention after the fall of the Timuirds, the Black and White sheep would move their tribes into the region, and these were Turkized Iranians. Then the rise of the Safavid, which would bring more Iranians/Persians into Iraq, and some of those got Arabized. However they don't form the tribal population.

However most Iraqi Arabs would deny their connection to Iranians/Iranics as their is to much bad blood between the two groups, especially those in the Western regions, which is quite tribal. In the North of Iraq, there are some Arabized Kurds, they know they are due to their strange names and don't have tribal affiliation with the nearby Arabian tribes. There some Iraqi Arabs who are Arabized Mesopotamian but they are a minority, and they only exist among the Sunni Arabs, and many of them claim to have had Christian ancestors in the past. However the Sunni Arab population in Iraq is diverse, since there are the tribal/Bedouin groups who usually maintain their distinct nature and are somewhat endogamous, Arabized Kurds in many localities, and also Arabized Mesopotamians who claim to have had Christian ancestors, however these two groups seem to have mixed to extent and have no tribal identity.

Also in the 19th century many Shia Persians migrated to Karbala and Najaf. In fact Karbala was majority Arabized Persian Shia at one point.

Thus Iraq can be said to be Arabian-Iranic nation, and no longer Mesopotamian with only few depending on the geography, and this can be seen in the cultural practices of Iraq which are clearly linked to the Gulf due to both Arabian and Persian influence. However most Iraqi Arabs would try to deny and say they have no link to Iranians/Iranics and would relate themselves partially to the Mesopotamians especially Babylonians, however Bedouin Iraqis would always boast about their Ishamelite Arabian and Yemenite ancestry, and are very hostile to Iranic people in general.