Kerr Newman was one of the vocabulary words listed on the chart "A Tunnel in the Sky". This chart was seen in the schoolroom aboard Deep Space 9 in 2369. (DS9: "In the Hands of the Prophets")
Kerr Newman is a reference to the Kerr-Newman metric, which is one of the exact solutions in general relativity. The metric is named after physicist Ezra T. Newman and mathematician Roy Kerr.