Weird, I tried to google it and found almost nothing. I was sure many cultures had this tradition when they call their child a fake name, while keeping real nam

Weird, I tried to google it and found almost nothing. I was sure many cultures had this tradition when they call their child a fake name, while keeping real name a secret. It is thought that evil forces cannot harm child if they don't know their real name. All I could find was a paragraph on wikipedia: All previously mentioned names fall into domestic category were used in family circle. However, when a person entered a broader social group (changing his occupation or place of residence), his name was replaced or supplemented by another. This sort of nickname exceeds family names in number - an adult has more distinct characteristics that can be used as a basis for a nickname than a child.