Look up teknonym in Wiktionary, the free dictionary.
Teknonymy is the practice of referring to parents by the names of their children. This practice can be found in many different cultures around the world.
An example of teknonymy can be found among the 'Malays' of Cocos (Keeling) Islands, where parents are known by the name of their first-born child. For instance, a man named Hashim and his wife, Anisa, have a daughter named Sheila. Hashim is now known as "Pak Sheila" (literally, "Sheila's Father") and Anisa is now known as "Mak Sheila" (literally, "Sheila's Mother").