Origin of the word "Arab".The word "Arab" has it's origins in the Hebrew language to refer mixed persons or races; or land inhabited by them.
Specifically Whites mixed with darker races, as the term means to darkened by admixture.
Hence Arabia is the land of the mixed multitude.
This term was adopted by those peoples as their own name, unknowingly to what it meant.
This would mean, any White person or race, darkened is by definition; an Arab. i.e. Mestizos
Source: Strongs Concordance 1890.