Lum vs Roll

Lum

name
  • A diminutive of the male given name Columbus 

  • A surname from Chinese. 

  • An English surname transferred from the place name. 

Roll

name
  • A diminutive of the male given name Roland. 

  • A surname. 

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