The Ulsterman - Monday 04 February 1856 carried a report from the Law Committee indicating it was agreed to attach spouts to some houses in certain streets, Plunkett Court is one of the streets.
Further Information
Possible origin suggested by John Ó'Néill - George and James Plunkett were muslin manufacturers on Carrickhill by 1819. In 1852 a George Plunkett had a pub at 118 Carrickhill beside the entry between Carrickhill & Union St known as Plunkett Court. So must be named after the family?