Īhaka or Ihaka is both a given name and a surname. It is a Māori transliteration of the name Isaac. Notable people with the name include:
Given name
Ihaka Hakuene (1836–1887), New Zealand tribal leader, lay reader, and politician Īhaka Takaanini (1800–1864), New Zealand tribal leader Īhaka Whaanga (died 1875), Ngati Rakaipaaka leader, assessor, military leader
Surname
Kīngi Īhaka (1921–1993), New Zealand Anglican priest Ross Ihaka (born 1954), New Zealand statistician