While many children were born to slaves in the Americas, and millions of their descendants are citizens in Brazil and the USA to this day, very few descendants of the slaves that ended up in the Middle East survive.
While most slaves who went to the Americas could marry and have families, most of the male slaves destined for the Middle East slave bazaars were castrated, and most of the children born to the women were killed at birth.
Excerpt From Slavery, Terrorism and Islam - The Historical Roots and Contemporary Threat
Dr. Peter Hammond