俗称

1. Origins, structure, and basic meaning

• Structure: 俗称 is read as ぞくしょう and is a noun for a popular or informal name used alongside or instead of an official one.
• Basic usage: Use 亀山と俗称される for what something is popularly called and 正式名と俗称 to contrast the two names.

2. Common pitfalls and similar expressions

• Official and informal names
  • The guide can provide both because 俗称 is a public or familiar label distinct from the formally established name.
• Not necessarily derogatory
  • A name inspired by a hill’s shape can be a convenient popular label and need not be mocking or insulting.