Plunkett is an Irish surname derived from the Gaelic Ó Pluingceid.
It is associated with Ireland, and possibly of Norse or Norman origin;[1] it may be spelled O'Plunket, Plunket, Plunkit, Plunkitt, Plonkit, Plonkitt, Plonket, Plonkett, or Ó Plunceid, and may refer to: Distant cousins of the families of Dunsany, Killeen, and Fingall A title in the Peerage of the United Kingdom