Elizabeth,
Your Question (s): Who was kush in the bible and who was his parents?
My Answer (s): The word "Kush" also spelled as "Cush" comes from the name "Cush" in the Holy Bible, as in most spelling of ancient times in the Hebrew, and especially among the Black community words are often spelled with the "K" instead of the "C". See also your Strong concordance, the word "Cush" is translated "Kuwsh" and pronounced as "koosh" with a "K" sound. In the Greek, this same Hebrew word is translated as "Ethiopia" having the same meaning as the Hebrew word "Kush or Cush".
Thank you for your question.
In Christ love,
Ron