ARAB HETEROGENEITY A 2018 study of Arabs found that Peninsular Arabs genetically

ARAB HETEROGENEITY
A 2018 study of Arabs found that Peninsular Arabs genetically showed two distinct clusters and that Arabs in general can be genetically stratified into four groups:

North African-Peninsular
The first consisting of Maghrebi Arabs (Algerians, Moroccans, Tunisians and Libyans) along with the first Arabian Peninsula cluster, which consists of Saudis, Kuwaitis and Yemenis;

Peninsular
The second compromising the second Arabian Peninsula cluster consisting of Omanis, Emiratis, and Bahrainis.

African
The third compromising Sudanese and Comorians;

Levantine
The fourth consisting of Levantine Arabs (Palestinians, Lebanese, Syrians and Jordanians) along with Egyptians and Iraqis;

The study confirmed the high genetic heterogeneity among Arabs, especially those of the Arabian Peninsula.;

Source:
Wiki, which points to:
Hajjej, Abdelhafidh; Almawi, Wassim Y.; Arnaiz-Villena, Antonio; Hattab, Lasmar; Hmida, Slama (2018-03-09). “The genetic heterogeneity of Arab populations as inferred from HLA genes”.