6 six with Keturah and 12 sons plus Mahalath descending from Ishmael. What is your understanding of the meaning of Ishmael?
Did Abraham and Ishmael build the Kaaba as islam claims? What is the blackstone all about? Wasn't their something similar on Cyprus devoted to Aphrodite, the closest we to Apiru imo? Read that apiru may refer to non-israelite hebrews, dunno.
Can't find much on Keturah. Wiki seems to think it may be the line of Midianites.
There are many groups that may be akin to the descendants of Abraham but there is so much info out there. Maybe Elamites or Ammorites, maybe Hurrians. I do not know but tradition says that the sons of Ishmael occupied Arabia as far as India and obviously we have the twelve tribes based around the area of the Tigris-Euphrates.