異姓

1. Origins, structure, and basic meaning

• Structure: 異姓 is a noun read いせい, meaning different surnames or the state of having a surname different from another person's.
• Basic usage: It can distinguish people with the same name on a list or describe siblings who have different family names.
  • 同名でも異姓なら名簿で区別できる。 says that people with the same name can be distinguished on the list if their surnames differ; 物語には異姓の兄弟が登場する。 says that siblings with different family names appear in the story.

2. Common pitfalls and similar expressions

• 異姓なら区別できる
  • なら makes differing surnames the condition under which the people can be distinguished.
• 異姓の兄弟
  • の links the siblings to their different family names.
• 異姓 and 同姓
  • 異姓 means having different surnames, while 同姓 means sharing the same surname.