Arab immigrations into British Palestine 2

Over the centuries, other settlers migrated and were intentionally implanted, including, in the 19th century alone, Egyptians fleeing from and imported by Muhammad Ali from the late 1820s to the 1840s,
Source : Rural Arab Demography and Early Jewish Settlement in Palestine: Distribution
By David Grossman pg 45

Other immigrants that now make up Palestinians today include Chechens, Circassians, and Turkmen relocated by the Ottoman Empire in the 1860s after its wars with Russia. Tribes of Bedouins, Algerians, Yemenis, and many others also immigrated during that century.

As for modern immigration, of high significance is the well-documented increases in Palestinian census numbers from 1922 to 1931, produced by illegal immigration spurred by the development of the region’s infrastructure and economy. One estimate sees some 37% of the increase in Palestinian population between 1922 and 1931, over 60,000 persons, having been the result of illegal immigration.
Source:
https://www.meforum.org/522/the-smoking-gun-arab-immigration-into-palestine

Another study found that from 1932 to 1946, another 60,000 illegal male immigrants entered the country, with uncounted females imported as brides. These were in addition to the great influx of Arab workers from 1940 to 1945 in connection with the war effort.
Source:
The Growth of Population in Palestine
E. Bromberger
Population Studies
Vol. 2, No. 1 (Jun., 1948), pp. 71-91