Kunya

A kunya is a Sraebadahn naming tradition that focuses on someone's deeds and parentage.
The most common kunyas generally refer to the familial relationship between a parent and their oldest child. 
A man who's son became a Pasha might use his name, Bahrin Adruhn, and the kunya "abu" for father, and his sons' name to create the name Bahrin Adruhn abu Basheer. This would roughly translate to "Bahrin Adruhn, the father of Basheer."
Alternatively, kunyas can be used to denote deeds and accomplishments. Such kunyas are traditionally given by an Emir or Emira or the Sultan. An Emir might grant a kunya to a soldier who saved his life in battle, or to a doctor that saved his child's life. 
Kunyas such as that one tend to be names that have the meaning of the deed. For example, el-Callah, meaning "divine majesty", might be given to someone who has performed a divine miracle. If the mans name, as in the above example, is Bahrin Adruhn, his new name would be Bahrin Adruhn el'Callah. Which would translate into "Bahrin Adruhn, the miracle worker". 

Familial Kunyas

Since a Kunya is most often used to denote familial relationships, there are a few standards that are used throughout Sraebadah and up into lower Khayal where the tradition is the most prevalent. 
Abu = Father of Uma = Mother of