middle name vs to-name

middle name

noun
  • A name between the first given name and the family name or surname; a second or subsequent given name. 

  • A trait, activity, or action closely associated with or aptly describing a person. 

  • One's mother's maiden name. 

to-name

noun
  • A name added to another name; surname. 

  • A name in addition to the Christian name and surname of an individual, to distinguish him or her from others of the same name and usually indicating descent, place of residence, or some personal quality or attribute. Such to-names are often employed where the same families continually intermarry, and where consequently the same name is common to many individuals. 

How often have the words middle name and to-name occurred in a corpus of books? (source: Google Ngram Viewer )