at least two from that list on the census were in Dublin in the 1860s..
  21 Holles-street, Herr Emilius Wespendorf, professor of German
       (
Harcourt Terrace in 1901)
  5 Crow Street, Jacob Frengley, watchmaker, and importer of watch
      materials and tools  (
Ranelagh Road  in 1901)
(from Thom's 1862, Dublin City listing - see directories in Dublin Resources)
Shane