DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [rolfs]
   
   ** English
   
   *** Etymology
   Borrowed from [en].
   
   *** Proper noun
   [es]
   
    1. [en] .
   **** Statistics
   
    - According to the 2010 United States Census, _Rolfs_  is the 36838 <sup> th </sup>  most common surname in the United States, belonging to 606 individuals. _Rolfs_  is most common among White (97.69%) individuals.
   *** Further reading
   
    - [R:en:DAFN]