a person named after another.
a person having the same name as another.

1640–50; alteration of name's (name + 's1) sake1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
namesake (ˈneɪmˌseɪk)
1.  a person or thing named after another
2.  a person or thing with the same name as another
[C17: probably a shortening of the phrase describing people connected for the name's sake]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1646, "person named for the sake of someone" is probably originally (for the) name's sake.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The arachnids' namesake appendages are covered in hairs that are sensitive to
  chemical signals and vibrations, she noted.
But sometimes a gelatinous namesake can be a dubious honor.
Island, where you can pull in on a beach and treat yourself to the island's
  namesake ice cream bar.
Halfway isn't the first town to take on an unusual namesake in the hopes of
  generating economic and tourist buzz.
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