Where did the Gentiles come from?

Gen.10:5 Says, “ By these were the isles of the Gentiles divided in their lands; every one after his tongue, after their families, in their nations.”  This is the generations of Noah.  I am guessing all of his kids are Jews.  Where the heck did the Gentiles come from?  Gen.7:22 says, “All in whose nostrils was the breath of life, of all that was in the dry land, died.” 7:23 And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark."  If this is true there should be no Gentiles at all.