namesake

from WordNet (r) 3.0 (2006)

namesake
    n 1: a person with the same name as another

from The Collaborative International Dictionary of English v.0.48

Namesake \Name"sake`\, n. [For name's sake; i. e., one named for
   the sake of another's name.]
   One that has the same name as another; especially, one called
   after, or named out of regard to, another.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "namesake":
      appellation, appellative, binomen, binomial name, byword, cognomen,
      cryptonym, denomination, designation, empty title, epithet, eponym,
      euonym, handle, honorific, hyponym, label, moniker, name, nomen,
      nomen nudum, proper name, proper noun, scientific name,
      secret name, style, tag, tautonym, title, trinomen,
      trinomial name

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