Adam
noun /ˈædəm/
  /ˈædəm/
Idioms - a first name for boys亚当:男孩的名字 词源from Hebrew 'ād̲ām ‘man’, later taken to be a name.
Idioms 
not know somebody from Adam 
- (informal) to not know at all who somebody is根本不认识某人;与某人素不相识