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Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [rattler]
   
   ** English
   
   *** Proper noun
   [Rattlers]
   
    1. [en] .
   **** Statistics
   
    - According to the 2010 United States Census, _Rattler_  is the 27164 <sup> th </sup>  most common surname in the United States, belonging to 891 individuals. _Rattler_  is most common among Black/African American (69.81%) and null (15.26%) individuals.
   *** Anagrams
   
    - [en]