Which british prime minister was part Iroquois?

The British Prime Minister who was part Iroquois was Lord Dunsany, also known as Edward Plunkett, the 18th Baron of Dunsany. He was a prominent figure in the early 20th century known for his contributions to literature and drama, but he was not a Prime Minister. However, there is no known British Prime Minister of Iroquois descent. If you are referring to a specific individual, please provide more context for clarification.