Wikipedia
Solluba
The Ṣolubba, also known as the Ṣleb and the Ṣulayb , were a Ḥutaymi tribal group in the northern part of the Arabian Peninsula who were clearly distinguishable from the Arabs.
They maintained a distinctive lifestyle as isolated nomads until the mid-20th Century, when the Solubba are believed to have merged into neighbouring ethnic groups. They were last seen by western travellers during the late 1940s.