Swan vs Swann

Swan

noun
  • someone connected with Swansea City Football Club, as a fan, player, coach, etc. 

  • someone connected with the Sydney Swans, as a fan, player, coach, etc. 

name
  • A surname transferred from the nickname. 

Swann

name
  • An unincorporated community in Cabell County, West Virginia, United States. 

  • A surname transferred from the nickname. 

How often have the words Swan and Swann occurred in a corpus of books? (source: Google Ngram Viewer )