Honestly, I’ve been many times to Hebron. There are among Arabs more than a few blonde-haired kids that I’ve seen. A big glass factory there is owned by a family that 200 years ago came from Germany, opened up shop, and converted to Islam. Islam is a religion that aggressively proselytizes, and has for centuries. The notion that all “Arabs” are of pure Middle-Eastern stock is nonsense.
Jews have accepted converts when they come to us, once we know they are sincere, but we do not go looking for them, much less coercing their conversion. An entire nation, the Khazars, converted to Judaism in the Middle Ages, and that engendered the myth that the Jews of Europe are all descended from the Khazars, which became very popular after Arthur Koestler’s The 13th Tribe was published. But seriously, the fact that Khazars joined the Jewish community does not mean that the Jewish community became subsumed within the Khazars. Their empire faded, many backslided to heathenism, but some stayed and married within the larger Jewish community. Koestler is a great novelist, but not a historian or geneologist.
I've defined Arabs above as being purely "Nejd Arabs", not Syriacs or Egyptians or Sudanese
Khazars were Turkics, not Indo-European so I don't see a heavy indose of "blood" in that sense
however, Yemeni Jews to my eyes (and note I repeat, this is not a scientic observation, just an observation of mine which could be wrong) look more Semitic