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Subj:.....LOGIC PROBLEM - Three Names (S559) 
          From: Puzzles And Brain Teasers on 10/2/07 
 Source: http://www.apuzzlezone.com/adailypuzzle/10-02-07.html

 At a party at College, three hosts/hostesses were asked to 
 pin their names on their shirts.  It looks like they wrote 
 numbers instead. Can you figure out their names?  Here are 
 the names on the tags: 31770, 317537, and 31573.


Flip the tags upside down. They say Ollie, Leslie, and Elsie.